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Role of Foliar Growth Retardants on Source Sink Relationship and Photosynthate Partitioning in Pigeonpea (Cajanus cajan L.) Genotypes
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Role of Foliar Growth Retardants on Source Sink Relationship and Photosynthate Partitioning in Pigeonpea (Cajanus cajan L.) Genotypes
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Role of Foliar Growth Retardants on Source Sink Relationship and Photosynthate Partitioning in Pigeonpea (Cajanus cajan L.) Genotypes
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Journal Article
Role of Foliar Growth Retardants on Source Sink Relationship and Photosynthate Partitioning in Pigeonpea (Cajanus cajan L.) Genotypes
2023
Overview
Plant metabolism can be regulated by the exogenous application of growth retardants which ultimately affects yield and yield attributes. The effect of foliar application of plant growth retardants such as mepiquat chloride (200 mL/ac), ethrel (200 ppm) and stance (200 mL/ac) was observed in two pigeonpea genotypes, i.e. PAU 881 and AL 201, at 60, (60 + 75) and 75 days after sowing (DAS). The effect of foliar spray treatment i.e. ethrel at 200 ppm at (60 + 75) DAS was significant on source-sink strength and dry matter partitioning in both genotypes especially on PAU 881. Leaves of plants treated with ethrel at (60 + 75) DAS exhibited higher total chlorophyll content (15.56%) and leaf area (10.61%), which increased the photosynthates that would eventually be utilized for grain production. Total soluble sugars (2.86 and 49.34%) and starch (27.01 and 27.13%) in leaves and stem increased with foliar applications of ethrel at (60 + 75) DAS, respectively. In the foliar treatment, the yield attributes, i.e. harvest index and number of pods per plant, were positively correlated with the leaf area (
r
= 0.76 and
r
= 0.72, respectively). Principal component analysis and regression analysis conferred an increase in sugar content in the leaf and stem, suggesting the role of growth retardants in altering the pathway of photosynthate production and increasing yield.
Publisher
Pleiades Publishing,Springer Nature B.V
Subject
/ Biomedical and Life Sciences
/ Chloride
/ ethephon
/ Leaves
/ mepiquat
/ Phenols
/ principal component analysis
/ Principal components analysis
/ Reagents
/ Seeds
/ starch
/ Stems
/ Sugar
