陇中地区马铃薯品种抗旱性综合评价OA

To address the constraints of drought stress on potato production and the scarcity of high-quality drought-tolerant varieties in the arid and semi-arid regions of Longzhong,this study aimed to screen drought-tolerant and high-yielding potato varieties suitable for cultivation in the cool and cold areas of Longzhong.Using 12 potato varieties(or lines)as materials,including'L14140-5','Ganyin 9',and'Ly 1742-2',a split-plot experimental design was implemented.The main plots consisted of two water treatments:drought stress(non-irrigation)and normal irrigation,while the subplots comprised the varieties.Agronomic traits such as plant height,leaf area index(LAI),SPAD values,and yield were measured.A comprehensive evaluation of drought tolerance was conducted using the drought resistance coefficient,principal component analysis,membership function method,and cluster analysis.The results revealed that:(1)drought stress significantly inhibited potato growth and yield.Under irrigation treatment,increases of 0.77％-67.74％in plant height,2.94％-32.25％in LAI,0.82％-83.01％in SPAD values,4.73％-21.07％in dry matter accumulation per plant,and 1.53％-75.89％in yield were observed compared to drought stress conditions.(2)Significant differences in drought tolerance were observed among varieties.'Longshu 10'exhibited the best performance,with only a 1.53％yield reduction under drought stress,a drought resistance coefficient of 0.98,and a drought resistance index of 1.402.(3)Cluster analysis categorized the varieties into three groups:four highly drought-tolerant varieties('Longshu 10','L14140-5','Ly1742-2','Ly1725-1'),six moderately drought-tolerant varieties,and two weakly drought-tolerant varieties('Fuda 1','Wotu 5').In conclusion,'Longshu 10'and'L14140-5'demonstrated excellent comprehensive traits,strong drought tolerance,and stable yields,making them suitable for promotion and cultivation in the semi-arid regions of Longzhong.Future research should involve multi-year and multi-location trials,combined with physiological,biochemical indicators,and molecular markers,to further elucidate the drought tolerance mechanisms and provide more comprehensive support for drought-resistant breeding.