20个马铃薯品种抗旱性鉴定及评价指标筛选

中国马铃薯生产区很大一部分在降雨不均或水资源不足地区,为满足此类地区品种需求,对马铃薯开展抗旱性评价.选择20个马铃薯常规栽培品种,在块茎膨大期对其植株叶片进行生理生化指标的测定,成熟期测产,综合评价抗旱性.结果表明,干旱胁迫对马铃薯块茎产量的影响极显著,胁迫后19个品种减产均达50％以上.测定的5个生理生化指标均与抗...

Evaluation index selection and drought resistance identification of 20 potato varieties

A large part of potato production areas are located in areas with uneven rainfall or insufficient water resources in China.In order to meet the variety needs of such areas,drought resistance evaluation of potato is extremely important.In this study,20 conventional potato cultivars were selected.By building rainproof awnings and adopting frame planting method,the physiological and biochemical indexes of their leaves were measured during tuber expansion period,and the yield was measured during maturity period to comprehensively evaluate drought resistance.The results showed that water stress has a very significant effect on yield,and the yield reduction after stress can reach more than 50%.The five physiological and biochemical indexes measured have different degrees of correlation significance with drought resistance coefficient and index,which can be considered as indexes for evaluating drought resistance of potato varieties.At the same time,membership function values were calculated according to the measured data of the five indexes after water stress,and the variety resistance was evaluated by combining the drought resistance coefficient and drought resistance index.It is considered that Kexin 19,Kexin 21,Chenggong,Kexin 2 and Dongnong303 are varieties with strong drought resistance.The results provide valuable theoretical basis for potato production and development in arid areas.