中国农业大学学报2024，Vol.29Issue(8)：77-85,9.DOI:10.11841/j.issn.1007-4333.2024.08.06
施氮量对马铃薯块茎淀粉积累及相关超微结构的调节效应
Effects of nitrogen application on starch accumulation and related ultrastructure in potato tuber
摘要
Abstract
In order to determine the regulatory effects of nitrogen application on starch accumulation and related ultrastructure in potato tuber of different starch type varieties,the high-starch variety'Kexin 22'and low-starch variety'Kexin 19'were selected and treated with nitrogen application rates of 0(CK),75,150,225 and 300 kg/hm2,respectively.The starch content,starch yield and the number and particle size of starch granules and amyloid bodies in tubers under different nitrogen application were measured.The relationship between starch content and starch granules and amyloid bodies in potato tubers was analyzed.The results showed that:The starch content of tubers of'Kexin 22'and'Kexin 19'varieties decreased with the increase of nitrogen application rate when nitrogen application rate was 0 to 300 kg/hm2.The starch content of tuber of the both varieties reached the highest values when nitrogen application rate was 0(CK)kg/hm2.The starch yield of tuber of the two varieties increased first and then decreased with the increase of nitrogen application.When the nitrogen application rate was 150 kg/hm2,the starch yield of high-starch variety'Kexin 22'reached the highest,which was 11.27 t/hm2.The starch yield of low-starch variety'Kexin 19'reached 8.99 t/hm2 when the nitrogen rate was 225 kg/hm2.The number of starch granules and amyloid bodies in the tubers of the two varieties showed a decreasing trend with the increase of N application rate,and the average particle size of starch granules and amyloid bodies showed a decreasing trend with the increase of N application rate,resulting in a decreasing trend of microscopic starch granule content in the tubers of the two varieties with the increase of N application rate.It was consistent with the decreasing trend of starch content in the tubers with the increase of N application rate.The proportion of starch granules and amyloid bodies with diameter(d)＜30 μm increased with the increase of N application rate,and the proportion of starch granules and amyloid bodies(d ≥30-50 μm and ≥50 μm)decreased with the increase of N application rate.When the nitrogen rate was 0(CK)kg/hm2,the number and size of starch granules and amyloids of the two varieties were the largest,the proportion of starch granules and amyloids(d＜30 μm)was the lowest,and the proportion of starch granules and amyloids(d ≥30-50 and ≥50 μm)was the highest.In conclusion,the starch accumulation and related ultrastructure of potato tubers of different starch potato varieties were greatly affected by nitrogen application.Therefore,the suitable nitrogen application should be determined according to the starch content,starch yield and ultrastructure changes of starch granules and starch bodies in the tubers of different starch type potato varieties.关键词
马铃薯/施氮量/块茎/淀粉含量/淀粉产量/淀粉粒/淀粉体Key words
potatoes/nitrogen application amount/tuber/starch content/starch yield/starch granules/amyloplast分类
农业科技引用本文复制引用
李勇,杨焕春,常向彩,杨轶,李静雯,柏光兰,庞丽..施氮量对马铃薯块茎淀粉积累及相关超微结构的调节效应[J].中国农业大学学报,2024,29(8):77-85,9.基金项目
国家自然科学基金项目(32260527) （32260527）
贵州省普通高等学校青年科技人才成长项目(黔教合KY字[2019]146) （黔教合KY字[2019]146）
安顺学院博士基金项目(Asxybsjj201901) （Asxybsjj201901）
贵州省科技拔尖人才项目(黔教合KY字[2020J040) （黔教合KY字[2020J040）
贵州省高等学校大学生创新创业训练计划(202210667012,S202210667061,S202210667020) （202210667012,S202210667061,S202210667020）
