干旱胁迫条件下不同抗旱性苹果砧木内源激素含量的变化

Changes of endogenous hormones contents of two different drought-tolerant Malus rootstocks in response to drought stress

以抗旱性差异显著的两种苹果砧木楸子(Malus prunifolia)和平邑甜茶(Malus hupehensisReld)为材料,研究了干旱胁迫对两种砧木根和叶中脱落酸(ABA)、生长素(IAA)、赤霉素(GAs)和玉米素核苷(ZR)含量的影响。结果表明:干旱胁迫下,与非抗旱砧木平邑甜茶相比,抗旱砧木楸子中抑制生长并作为信号物质的ABA含量在第7和14天具有较高的上升水平,而促进生长的IAA下降幅度大,且含量相对较低,同时,干旱胁迫后多数时间点上抗旱砧木楸子中GAs和ZR含量高于非抗旱砧木平邑甜茶,说明内源激素含量及变化差异在一定程度上影响苹果砧木的抗旱性。

We used two different drought tolerant Malus rootstocks, i.e., Malus prunifolia and M. hupehensis Reld, to study the effect of drought stress on the content changes of endogenous hormones, such as ABA, IAA, GAs and ZR in leaves and roots. The results showed that the content of endogenous hormones varied in both organs according to genotype, organ and different time points. Comprehensive analysis indicated that ABA, as signal material, which can in- hibit growth, increased significantly in M. prunifolia compared with that of M. hupehensis under drought condition, es- pecially on day 7 and day 14. However, IAA, which can promote growth, decreased significantly in drought-tolerant rootstock M. prunifolia. Moreover, at most time points, drought-tolerant rootstock M. prunifolia had higher values than that of drought-sensitive rootstock M. hupehensis in terms of GAs and ZR contents. Different endogenous hormones con- tents and variation tendencies under drought stress probably play certain roles in influencing drought-tolerance in Malus.