Differences In Morphological And Physiological Properties Of Different Winter Wheat Cultivars Under Drought Stress

Taking the current main varieties planted in Henan province as a test material, weinvestigated the differences in growing development, Photosynthetic and Chlorophyll fluorescencecharacteristic, the content of Pro and dry matter accumulation, yield etc. with different varietieswinter wheat under drought through seedling cultivation indoor, pool planted and field planted. Themain conclusions are as follows:1. Length of roots growth of each winter wheat seeding was significantly inhibited underPEG-6000simulation drought stress, the inhibited extend and stress level become direct ratio, andthe change of Luohan6was most notable. The variation trend of the dry weight of winter wheatseedlings’ overground parts increased under moderate drought stress and reduced under high droughtstress. The variation trend of the root/shoot ratio first declined then rised under PEG-6000simulationdrought stress, roots were influenced first at early treatment, so the root/shoot ratio reduced. Thenoverground parts were influenced, so the root/shoot ratio rised, the rise range of Luohan6andZhengmai366was separately abvious under moderate drought stress and high drought stress.2. Dry matter accumulation of winter wheat was influenced under drought stress at floweringperiod, but the change of different varieties and organ is differet. Dry matter accumulation ofLuohan6and Aikang58reduced under drought stress and other varieties’ increased. The influenceof the different irrigation times and the drought stress at flowering period on the spike number, thethousand seed weight and the yield of winter wheat was significantly, but the change of grains perspike was not obvious.The spike number, the thousand seed weight and the yield of winter wheat allreduced under drought stress, the variation trent of the thousand seed and the yield is agreed, thedecline extent is proportional to the stress degree.3. LAI of different wheat varieties reduced and lowering speed expedited with irrigatingfrequency reduced, and otherness notable, the lowering speed of Zhoumai18and Yumai49is fastest.Pn、Gs and Tr declined following irrigating frequency reduced. The variation trent of Pn was declineafter rising within a single treatment, Pn of Aikang58were high under one and two irrigationfrequency treament. Gs and Tr of each wheat varieties showed Zhoumai18＞Yunong202＞Yumai49＞Zhengmai366＞Aikang58within grain-filling period under a single treatment. Ci increased with irrigation frequency decreased, the variation trent showed rise after declining under a singletreatment, and spikes in seven days after flowering.4. The content of Chlorophyll a in winter wheat seedlings declined under drought stress, and thedecrease range increased following stress level deepened, each variety’ decrease range wasmaximum after dealed with3d under moderate drought stress, but after deal with5d was maximumunder high drought stress. The content of Chlorophyll b in winter wheat seedings increased littleunder drought stress, but content declined under long time stress. The total content of Chlorophyllreduced under drought stress, and it was proportional to stress degree. The change trend on thecontent of Chlorophyll (SPDA value) in wheat flag leaves with different varietes is different underdrought stress at flowering period, but by and large the content on a declining curve. The variationtrent of Fv/Fm and qP showed a declining curve under drought stress, and the descended rangebecame bigger, among the change of Zhoumai18was obvious. NPQ rised on the early and latestress, but declined on middle stress.5. The content of Pro in winter wheat rised significantly under drought stress, and the amplitudeof variation on the content of Pro in wheat leaves was greater than in the wheat roots. The content ofPro in wheat leaves increased under high drought stress, the variety that the content increasedmaximal was Xinong979and Zhengmai366, the conent of Pro in wheat roots increasedunconspicuous under moderate drought stress, but that increased significantly under high droughtstress, among the content of Pro on Xiong979ascensional range was maximum.