六倍体小黑麦灌浆期抗旱性分析

采用盆栽在六倍体小黑麦灌浆期控水模拟干旱,分析干旱对各个农艺性状指标的影响,然后采用模糊隶属函数与抗旱系数相结合的方法对品种灌浆期的抗旱性进行综合分析,再利用灰色关联度分析各个形态指标与抗旱性的关系,结果表明:(1)灌浆期水分胁迫下所有品种都表现出株高降低,穗长变短,单株粒重、千粒重下降,每穗总小穗数、主茎穗粒数减少,而且与对照之间达差异显著或极显著;(2)品种“Tornado”对灌浆期干旱具有强的抗性,可作为今后小麦抗旱育种的种质资源;(3)单株粒重、主茎穗粒数、千粒重与抗旱性关联度大,可作为灌浆期抗旱形态指标。

Drought Resistance Analysis of Hexaploid Triticale at Grain Filling Stage

Pot culture and controlling water were used to induce water stress at the grain filling stage,the change of plant height,ear length,spike numbers,grains main stem spike,seed weight per plant,thousand seed weight were investigated.Then drought resistance of hexaploid triticale at grain filling stage were analyzed by fuzzy subordinate function analysis and drought-resistance coefficients.Finally,the relationship between each morphological index and drought resistance were studied using grey correlative degree analysis.The results showed as follows:(1) The plant height,ear length,spike numbers,grains main stem spike,seed weight per plant,thousand seed weight of each variety were decreased or shorted when compared with control,and differences among triticale varieties were significant or very significant.(2) Variety "Tornado" was high resistant to drought at grain filling stage and would used as a good germplasm in wheat breeding.(3) Correlative degree between seed weight per plant,grains main stem spike,thousand seed weight and drought resistance of hexaploid triticale at grain filling stage was highest,would utilized as morphological indexes of drought-resistance.