2011•Agricultural Science and Technology HunanRequires access
Effects of drought stress on germination of tall fescue.
Jian Lan, Shen Yan, Xie Yingzhong
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Abstract
[Objective] The aim was to explore the effects of drought stress on germination of tall fescue.[Method] Simulation drought experiment on 14 varieties of tall fescue seeds by PEG-6000 researched its germination effect under drought resistance.[Result] The relative germination rate of all tall fescue varieties declined with intensifying drought stress level with the water potential of-0.6 Mpa as the turning point;the relative germination rate of tall fescue existed linear relationship with drought stress:Y = 70.412X + 103.11,r=0.988 8.The sensible water potential range was ≥-0.40 Mpa for tall fescue under drought stress.LC50 of water potential was-0.76 Mpa,the lethal water potential was-1.33 Mpa.Arid Ⅲ,Crossfire Ⅱ and Traple A had stronger drought resistant ability,but Pixie,Infero and Poppoint had weaker drought resistant ability.[Conclusion] This study had provided reference for cultivated pasture and drought resistant breeding.