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不同沙棘品种抗旱性的比较
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不同沙棘品种抗旱性的比较
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Journal Article
不同沙棘品种抗旱性的比较
2015
Overview
沙棘抗旱性是多因素作用的结果，如果只利用单因素／单项指标评价其抗逆性，则具有一定的片面性。本研究对干旱胁迫下4个沙棘品种的多项生理生化指标的变化进行比较分析，并通过主成分分析和综合评价发现：乡土中国沙棘（河北丰宁种源）品种的抗旱性最强，引进大果沙棘-乌兰格木品种的抗旱性最差，引进的4个沙棘品种抗旱能力强弱的排序为：丰宁（0．619）〉楚伊（0．445）〉向阳（0．390）〉乌兰格木（0．274）。净光合速率、蒸腾速率、气孔导度、叶水势、谷胱甘肽还原酶和脱落酸的含量可作为沙棘抗旱性的判定指标。随着干旱胁迫的加剧，与对照相比，4个引沙棘品种的净光合速率、蒸腾速率、气孔导度和叶水势均下降，而超氧化物歧化酶活性、细胞膜透性、谷胱甘肽还原酶和四大激素均上升，这说明干旱逆境胁迫影响了沙棘正常的生长发育过程，同时通过内在的生理生化指标的改变来增加其自身对逆境胁迫的抵抗能力。这些将为沙棘抗旱树种的筛选和进一步的杂交育种提供依据。
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