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

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 hupehensis Reld)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...

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

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 inhibit growth, incre ased significantly in M. prunifolia compared with that of M. hupehensis under drought condition, especially 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 GA s and ZR contents. Different endogenous hormones contents and variation tendencies under drought stress probably play certain roles in influencing drought-tolerance in Malus.