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Shandong Agricultural University (2017)

Study on Response of Different Peanut Cultivars to Drought Stress and Rewatering and Its Mechanisms

张铭;

Titre : Study on Response of Different Peanut Cultivars to Drought Stress and Rewatering and Its Mechanisms

Auteur : 张铭;

Grade : Doctoral Dissertation 2017

Université : Shandong Agricultural University

Résumé partiel
Peanut is an important oil crop in our country,the cutltivated area of peanut in China is only next to that of rape,which occupies 1/4 of the cultivated area of oil crops.The total yield is the first of the national oil crops,which accounts for more than 50%.Because of stronger drought and barren resistance,peanut has become the first choice of crops in the arid and semiarid rain-fed region to develop the agricultural production.In China and around the world,peanuts are often grown in sandy loam,or area lack of irrigation,in most of the peanut planting area,rainfall distribution is usually not uniform in growing season,and they often fluctuate between months and years.Compared to other crops,peanut drought resistance is stronger,but on the critical stage of their demand for water,water lack also resulted in severe or irreversible inhibition on peanut growth and development.According to statistics,70% of the peanut cultivated area in our country are threatened by drought,the annual yield loss caused by drought reached 30% 50%.At the meantime,drought also causes decline of quality and greatly increases the risk of peanut to pollution of Aspergillus.Therefore,drought stress is the most important abiotic factor that limits peanut yield and quality improvement.This study we chose five peanut varieties of different drought resistance,study their plant traits,photosynthetic characteristics,osmotic adjustment function,proline metabolism,antioxidant properties,pods and seeds quality changes in respose to drought stress and rewatering at different growth stages.Clear the mechanism of drought resistance for different peanut varieties.It can perform an important function for identification and evaluation of peanut germplasm resources to drought resistance more accurate and effective,mining of different advantage traits of peanut varieties to drought resistance,and strengthen specific of drought breeding and effectiveness of water-saving cultivation.The experiments were conducted at the Field Crop Research Station of Shandong Agricultural University during 2013-2014.The main research results are as follows:1.Biomass(yield)and drought resistance of different peanut cultivarsDrought resistant coefficient is ratio of crop yield affected by drought stress and crop yield of control(unstressed by drought),it is an widely used standard for drought resistance identification and evaluation in current.In our study,drought resistance coefficient method was used to evaluate the drought resistance of the five peanut varieties,the results showed that drought resistance of the five peanut varieties performed consistently in response to drought and rewatering at the seedlings stage and pod setting stage,they ranked in the order : Lipudahuasheng > Shanhua 11 > Huayu 20 > ICG6848 > Hua 17.Identified drought resistance of the five peanut varieties immediately when the drought treatment was over at the seedlings stage and pod setting stage,results showed large difference to this.It suggested that there was compensation effect after the peanut plant experiented drought stress and rewatering.In the peanut production,the occurrence of drought is usually intermittent,and more attention should be paid to the compensation effect after drought.2.Biomass and harvest index response to drought stress and rewatering at the pod setting stageLipudahuasheng gained the highest drought tolerance,because the biomass did not differ significantly,and its harvest index became higher.While percentage of stem for Hua17 got higher,it was a waste of assimilate,and its biomass and harvest index both declined significantly,so yield for it decrease markedly,drought coefficient for it became the lowest.3.Plant traits response to drought stress and rewateringIn the investigated plant traits,was affected the most both at the seedlings stage and pod setting stage drought stress.

Mots clés : Peanut; Drought resistant; Photosynthetic characteristics; Antioxidant properties; Osmotic adjustment; Quality

Présentation (CNKI)

Page publiée le 14 janvier 2018