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Agricultural University of Hebei (2021)

Study on Responses of Oat to Water Stress and Factors Limiting Dry-land Naked Oat Yield

李彦霞

Titre : Study on Responses of Oat to Water Stress and Factors Limiting Dry-land Naked Oat Yield

Auteur : 李彦霞

Grade : Master 2021

Université : Agricultural University of Hebei

Résumé partiel
In order to study the effects of water stress on the growth and yield of different drought-resistant oat varieties and the yield difference of naked oats among different land types,and to clarify the physiological response mechanism of different oat varieties on water stress and the limiting factors of the yield difference of different land types,two years pot and dry pood experiment was conducted in Bashang Base of Zhangjiakou Academy of Agricultural Sciences from 2019 to 2020,and the farmers’ production survey was conducted in the surrounding main oat producing areas.Six oat varieties including skin oats(Avena sativa L)(Zhangyan 1、Zhangyan 3、Zhangyan 4)、Naked oats(Avena nuda L)(Zhangyou 7、Zhangyou 14 and 0905-12-14)were used as experimental materials in the dry pond experiment,two treatments of adequate water supply and water stress were set up,the indexes of photosynthesis、fluorescence and yield of oat varieties were respectively measured at heading and flowering stages,the drought resistance of oat was evaluated by drought resistance index and drought resistance membership function method,and the correlation between different physiological indexes and drought resistance were analyzed.The pot experiment used 0905-12-14 as the test material,and set up four treatments of normal water supply(CK)、mild drought(LS)、moderate drought(MS)、severe drought(SS),the relative water content of soil was 70-80%,60-70%、50-60%and 35-45%of the maximum field capacity,the effects of water stress on morphology、photosynthetic、physiological and yield indexes were analyzed at jointing and heading stages ;The factors restricting naked oat yield were systematically analyzed from the technical and economic perspectives,the differences of farmers under different yield levels were compared and analyzed,the factors affecting oat yield in dry land were explored.The results show that:The order of drought resistance sequence of oat varieties evaluated by drought resistance index and drought resistance membership function is basically the same,it is concluded that 0905-12-14 was strong drought-resistant variety,Zhangyou 14 was drought-resistant variety,Zhangyan 1 and Zhangyan 4 were moderately resistant varieties,Zhangyan 3 and Zhangyou 7 were weakly resistant varieties,and the correlation between yield characters and photosynthetic parameters was strong under water stress at heading and flowering stages,the correlation between photosynthetic rate and drought resistance was also strong.The photosynthetic index、drought resistance coefficient、drought resistance index and sensitivity index could be used as the preliminary identification index of drought resistance in oats.Water stress affected the growth and development of oat,resulted in plant height and leaf area of oats compared with normal water supply were significantly decreased.Under severe water stress,the plant height and leaf area respectively decreased by 29%、47%at jointing stage,and that decreased by 26%、40%at heading stage.Water stress reduced the photosynthetic indexes of oat,resulted in the intercellular CO2 concentration、transpiration rate、stomatal conductance and photosynthetic rate were decreased.However,the photosynthetic performance of different varieties and different growth stages had different responses and adaptability to water stress.Under severe water stress,the intercellular CO2 concentration、transpiration rate、stomatal conductance and photosynthetic rate of 0905-12-14 varieties compared with normal water supply were decreased by 24%、30%、55%、34%at jointing stage,and that decreased by 11%、29%、69%、59%at heading stage

Mots clés : Water stress ;Oats;Physiological characteristics ;Drought resistance evaluation ;Yield;Limiting factors ;

Présentation (CNKI)

Page publiée le 19 novembre 2021