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In What We Sow, Jennifer Jewell brings readers on an insightful, year-long journey exploring the outsize impact one of nature's smallest manifestations--the simple seed. She examines our skewed notions where \"organic\" seeds are grown and sourced, reveals how giant multinational agribusiness has refined and patented the genomes of seeds we rely on for staples like corn and soy, and highlights the efforts of activists working to regain legal access to heirloom seeds that were stolen from Indigenous peoples and people of color. Throughout, readers are invited to share Jewell's personal observations as she marvels at the glory of nature in her Northern California hometown. She admires at the wild seeds she encounters on her short daily walks and is amazed at the range of seed forms, from cups and saucers to vases, candelabras, ocean-going vessels, and airliners. What We Sow is a tale of what we choose to see and what we haven't been taught to see, what we choose to seed and what we choose not to seed. It urgently proves that we must work hard to preserve and protect the great natural diversity of seed.

This book examines the impact of genetically modified seeds on traditional societies and the corporate monopolization of the world's food supply. The time-honored practice of reclaiming and replanting the seed has become a crime, thereby fostering a feudalistic relationship of perpetual dependence on the corporation.

Plant growth-promoting rhizobacteria (PGPR) increase plant growth and crop productivity. The inoculation of plants with a bacterial mixture (consortium) apparently provides greater benefits to plant growth than inoculation with a single bacterial strain. In the present work, a bacterial consortium was formulated containing four compatible and desiccation-tolerant strains with potential as PGPR. The formulation had one moderately (Pseudomonas putida KT2440) and three highly desiccation-tolerant (Sphingomonas sp. OF178, Azospirillum brasilense Sp7 and Acinetobacter sp. EMM02) strains. The four bacterial strains were able to adhere to seeds and colonize the rhizosphere of plants when applied in both mono-inoculation and multi-inoculation treatments, showing that they can also coexist without antagonistic effects in association with plants. The effects of the bacterial consortium on the growth of blue maize were evaluated. Seeds inoculated with either individual bacterial strains or the bacterial consortium were subjected to two experimental conditions before sowing: normal hydration or desiccation. In general, inoculation with the bacterial consortium increased the shoot and root dry weight, plant height and plant diameter compared to the non-inoculated control or mono-inoculation treatments. The bacterial consortium formulated in this work had greater benefits for blue maize plants even when the inoculated seeds underwent desiccation stress before germination, making this formulation attractive for future field applications.

Public-private partnerships (PPPs) are globally recognized for their potential to accelerate genetic improvement and delivery of new high-yielding seed varieties in developing countries. However, despite the strong advocacy for PPPs in crop improvement, there is little empirical evidence about their performance, capacities, and contribution to the development of seed industries and the promotion of competitive seed markets. This paper uses the experience of the MasAgro maize consortium, a PPP in Mexico, to examine crop variety innovation and delivery through PPPs, assess PPPs’ capacities to commercialize public germplasm-based varieties, and derive lessons for the design and implementation of future PPPs. Drawing on a combination of multiple data sources, we examined the PPP’s performance in the generation, dissemination, and commercialization of new maize hybrids. Our examination over the period 2011–2019 shows that the consortium was successful in maintaining a substantial flow of agronomically competitive maize hybrids, which compared favourably with the number of new varieties generated by national and international seed companies and the public sector. The partnership also contributed to refreshing and rejuvenating the variety portfolios of the consortium companies, which appear to have succeeded in bringing MasAgro varieties quickly into the market. However, seed sales achieved by MasAgro hybrids over this period remained small and multinational companies consistently maintained their leadership in the maize seed market. Our analysis shows that PPPs have strong capacities for the development of competitive seed varieties, but they face significant challenges in scaling up the uptake and adoption of these innovations in highly concentrated markets. To succeed in their objective of delivering affordable, high-quality seed on a large scale to smallholder farmers in developing countries, PPPs need to urgently incorporate a commercial and market-oriented perspective along all steps of the plant breeding and dissemination process.

Longstanding theory predicts that strategic flexibility in when and how to use social information can help individuals make adaptive decisions, especially when environments are temporally or spatially variable. A short-term increase in reliance on social information under these conditions has been experimentally shown in primates, including humans, but whether this occurs in other taxa is unknown. We asked whether migration between spatially variable environments affected social information use with a large-scale cultural diffusion experiment with wild great tits ( Parus major ) in captivity, a small passerine bird that can socially learn novel behaviors. We simulated an immigration event where knowledgeable birds were exchanged between groups with opposing preferences for a socially learned foraging puzzle, living in similar or different environments. We found evidence that both immigrants and residents were influenced by social information and attended to the rewards that others received. Our analysis supported the use of a payoff-biased social learning by immigrants when both resources and habitat features were spatially variable. In contrast, immigrants relied more-so on individual learning when payoffs or the environment were unchanged. In summary, our results suggest that great tits assess the payoffs others receive and are more influenced by socially observed differences in payoffs when environmental cues differ in their new environment. Our results provide experimental support for the hypothesis that spatial variability is a strong driver for the evolution of social learning strategies.

Neonicotinoid seed treatments, typically clothianidin or thiamethoxam, are routinely applied to >80% of maize (corn) seed grown in North America where they are marketed as a targeted pesticide delivery system. Despite this widespread use, the amount of compound translocated into plant tissue from the initial seed treatment to provide protection has not been reported. Our two year field study compared concentrations of clothianidin seed treatments in maize to that of maize without neonicotinoid seed treatments and found neonicotinoids present in root tissues up to 34 days post planting. Plant-bound clothianidin concentrations followed an exponential decay pattern with initially high values followed by a rapid decrease within the first ~20 days post planting. A maximum of 1.34% of the initial seed treatment was successfully recovered from plant tissues in both study years and a maximum of 0.26% was recovered from root tissue. Our findings show neonicotinoid seed treatments may provide protection from some early season secondary maize pests. However, the proportion of the neonicotinoid seed treatment clothianidin translocated into plant tissues throughout the growing season is low overall and this observation may provide a mechanism to explain reports of inconsistent efficacy of this pest management approach and increasing detections of environmental neonicotinoids.

Industrial hemp is a versatile, sustainable plant with several applications of its various forms, including fiber obtained from hemp stalks, food obtained from hemp seeds, and oil obtained from hemp flowers and seeds. Industrial hemp has the potential to offer a solution to the crisis of climate change, since it is a viable energy source that satisfies the three pillars of sustainability, namely economy, environment, and society. Although industrial hemp has been growing as an agricultural commodity in different parts of the world for decades, its production was banned until recently in the U.S. because of its association with marijuana. We conducted a literature review to explore some of the reasons why the U.S. production of industrial hemp has increased significantly since the ban was lifted. Our findings revealed that hemp’s rapidly increasing popularity in the U.S. since 2018 can be attributed, in part, to its sustainability potential (defined as the potential to positively impact the sustainability of products, using hemp as a renewable raw material). This study fills a gap in the knowledge regarding hemp’s potential as a sustainable crop.

The persistence of undetectable disseminated tumour cells (DTCs) after primary tumour resection poses a major challenge to effective cancer treatment 1 – 3 . These enduring dormant DTCs are seeds of future metastases, and the mechanisms that switch them from dormancy to outgrowth require definition. Because cancer dormancy provides a unique therapeutic window for preventing metastatic disease, a comprehensive understanding of the distribution, composition and dynamics of reservoirs of dormant DTCs is imperative. Here we show that different tissue-specific microenvironments restrain or allow the progression of breast cancer in the liver—a frequent site of metastasis 4 that is often associated with a poor prognosis 5 . Using mouse models, we show that there is a selective increase in natural killer (NK) cells in the dormant milieu. Adjuvant interleukin-15-based immunotherapy ensures an abundant pool of NK cells that sustains dormancy through interferon-γ signalling, thereby preventing hepatic metastases and prolonging survival. Exit from dormancy follows a marked contraction of the NK cell compartment and the concurrent accumulation of activated hepatic stellate cells (aHSCs). Our proteomics studies on liver co-cultures implicate the aHSC-secreted chemokine CXCL12 in the induction of NK cell quiescence through its cognate receptor CXCR4. CXCL12 expression and aHSC abundance are closely correlated in patients with liver metastases. Our data identify the interplay between NK cells and aHSCs as a master switch of cancer dormancy, and suggest that therapies aimed at normalizing the NK cell pool might succeed in preventing metastatic outgrowth. Liver-resident natural killer (NK) cells sustain the dormancy of disseminated breast cancer cells, and a decrease in NK cells and increase in activated hepatic stellate cells is associated with the formation of liver metastases.

A frame-shift mutation in MATRILINEAL, a pollen-specific phospholipase, triggers haploid induction in maize, which may be useful in developing improved haploid induction systems for crop breeding. Haploid induction in maize Haploid inbred lines are a valuable tool for genetic research and the hybrid breeding of crop plants. Timothy Kelliher et al . now examine the genetic basis of haploid induction in maize, and find that a frame-shift mutation in MATRILINEAL , a pollen-specific phospholipase, triggers haploid induction in these lines. This finding may be useful for the development of improved haploid induction systems for crop breeding. Sexual reproduction in flowering plants involves double fertilization, the union of two sperm from pollen with two sex cells in the female embryo sac. Modern plant breeders increasingly seek to circumvent this process to produce doubled haploid individuals, which derive from the chromosome-doubled cells of the haploid gametophyte. Doubled haploid production fixes recombinant haploid genomes in inbred lines, shaving years off the breeding process 1 . Costly, genotype-dependent tissue culture methods are used in many crops 2 , while seed-based in vivo doubled haploid systems are rare in nature 3 and difficult to manage in breeding programmes 4 . The multi-billion-dollar maize hybrid seed business, however, is supported by industrial doubled haploid pipelines using intraspecific crosses to in vivo haploid inducer males derived from Stock 6, first reported in 1959 (ref. 5 ), followed by colchicine treatment. Despite decades of use, the mode of action remains controversial 6 , 7 , 8 , 9 , 10 . Here we establish, through fine mapping, genome sequencing, genetic complementation, and gene editing, that haploid induction in maize ( Zea mays ) is triggered by a frame-shift mutation in MATRILINEAL ( MTL ), a pollen-specific phospholipase, and that novel edits in MTL lead to a 6.7% haploid induction rate (the percentage of haploid progeny versus total progeny). Wild-type MTL protein localizes exclusively to sperm cytoplasm, and pollen RNA-sequence profiling identifies a suite of pollen-specific genes overexpressed during haploid induction, some of which may mediate the formation of haploid seed 11 , 12 , 13 , 14 , 15 . These findings highlight the importance of male gamete cytoplasmic components to reproductive success and male genome transmittance. Given the conservation of MTL in the cereals, this discovery may enable development of in vivo haploid induction systems to accelerate breeding in crop plants.

Background In western countries such as Canada, immigrants are experiencing cultural food insecurity - that is the inability to acquire, afford, and access one' ethnic foods and community gardens have emerged as potential area for addressing cultural food insecurity. However, limited knowledge exists on the role of collective community gardens in addressing the cultural food needs of immigrant communities. Methods We conducted a community-based participatory research (CBPR) informed by an Afrocentric lens using quantitative and qualitative research methodologies. Data collection involved an online survey ( n  = 119) which was co-developed and co-administered with our community partners– Sinkunia Community Development Organization (SCDO). Semi-structured, in-depth interviews (IDI) were also conducted with purposefully sampled participants ( n  = 10) to obtain nuanced narratives. This study included Black identifying African immigrants from sub-Saharan countries. Results High prevalence of food insecurity (75.6%) was observed in the survey participants, higher than the general Canadian household prevalence rate. Participants recalled experiencing food insecurity ranging from mild (39.5%) to moderate (26.1%) and severe (10.1%) food insecurity. High prevalence of cultural food insecurity (80.7%) was also observed with most participants reporting some level of deprivation of cultural foods. However, participants demonstrated resilience and adaptability in maintaining their cultural food-ways amid these challenges. Collective community gardens allowed immigrant communities to: (a) cultivate connections through food production (‘seeds of sovereignty’); (b) build intergenerational bridges (‘seeds of identity’); (c) grow together across generations; and (d) grow strong to embody health and wellbeing. Conclusion The findings contribute to a growing body of evidence on the embodied benefits of community gardens for food security and social place-making of immigrant populations. High interest and engagement in gardening activities in the population suggests potential for expansion of community-led initiatives to support social and cultural integration of immigrant. This is important to Alberta’s and to Canada’s current and future sustainable economic and social growth.