影响喜旱莲子草性别可塑性表现形式的环境因子的研究

Research on the environmental factors regulating the phenotypic states of gender plasticity in Alternanthera philoxeroides

关键词:  喜旱莲子草  亚稳定可塑性  心皮化  正交实验

Key words:  Alternanthera philoxeroides  metastable plasticity  pistillody  orthogonal experiments

摘要:

亚稳定可塑性会显著影响植物个体的适合度和个体对环境的反应模式，因此，探讨其起因和维持机制成为非常重要的科学问题。喜旱莲子草性别特征表现为亚稳定可塑性而其它表型特征为常规的可塑性。通过正交控制实验，量化喜旱莲子草的表型特征在不同环境条件下的可塑性表现。结果表明：（1）决定喜旱莲子草性别可塑性和其他大多数可塑性的环境因素相同；（2）在不同环境条件下，喜旱莲子草个体性别大多表现为完全心皮化或雌雄同花，在二者之间的多种中间形态不足总个体数的1%。由实验结果可以推断出，喜旱莲子草的性别亚稳定可塑性有两个亚稳态，亚稳定可塑性特征的产生由喜旱莲子草内部因素决定。

Abstract:

Metastability plasticity could significantly affect the fitness and response model of individual plant to environment. Therefore，it is important to explore the inducement and operating mechanism of metastability plasticity. Alternanthera philoxeroides shows metastable plasticity on gender trait，but stable plasticity on other phenotypic variations. In this study，orthogonal experiments were conducted to quantify the plasticity of phenotypic traits on A.philoxeroides，under various control conditions. The result showed that:(1)environmental factors that determine the gender plasticity are also the primary factors for many other plastic traits；(2)under different control environment，monoclinous and completely pistillate genets are the majority of experimental plants，while incomplete pistillody individuals are less than 1.0% of the total. Through the results，we can make the conclusions that，A.philoxeroides has two metastable states for gender trangeneration plasticity，and this metastability plasticity is intrinsically caused by individual plant.