The Endogenous Hormone Level and Drought Adaptability of Four Kentucky Bluegrass Species in Gansu, China
Some wild germplasm materials of Kentucky bluegrass collected from Gansu Province (Longxi,Qingshui,Qinzhou) were used as doner materials,and the Midnight Ⅱ,a commercial variety,was set as control.The content of abscisic acid (ABA),indole-3-acetic acid (IAA) and zeatin (ZT)in leaves of Kentucky bluegrass exposed to drought stress were determined by improved HPLC.The results showed that:The grass from Qingshui and Qinzhou wilted and died after the drought stress,however,the Midnight Ⅱ that from Longxi survived.ZT content of all the materials significantly decreased and the descent range was 59.25 ％-66.02 ％ ; both ABA and IAA content increased firstly and then decreased,compared with the control,ABA content significantly increased and the rising range was 23.63％-59.55％; while IAA content significantly decreased,and the descent range was 48.34 ％-53.35 ％.In addition,the ZT/ABA、ZT/IAA and (ZT+IAA)/ABA decreased,suggesting that the grass could slow down growth to adapt to drought stress in initiative way.The drought resistance ability of the doner materials ranked as Longxi＞ Midnight Ⅱ ＞Qinzhou＞Qingshui.It was done at the evaluation standard of hormones level.The study may provide reference evidences for the selection of excellent varieties and germplasm materials for turf establish in arid region.
NETL
NSTL
万方数据
维普
