水分胁迫对马铃薯的生理反应

PHYSIOLOGICAL REACTION OF POTATO CROP UNDER WATER STRESS CONDITION

以中早熟品种“坝薯９号”、中晚熟品种“坝薯１０号”和“乌盟８５１”为试材，研究了干旱对马铃薯的影响，结果表明：①随着水分胁迫时间的延长和胁迫强度的增加，叶片相对含水量和叶水势下降，蒸腾强度减弱，伤流量减少；植株高度、茎粗、叶片长和宽、功能叶间距均降低；块茎单株产量和收获指数降低，块茎干物质含量提高；叶绿素含量与光合作用强度随水分胁迫时间延长而降低，但随胁迫强度的增加而提高．②单株产量与叶水势和收获指数是显著正相关，与块茎干物质含量是显著负相关．③坝薯９号和乌盟８５１是两个耐旱品种．

Using early-medium maturity cultivar Bashu No. 9 and medium-late maturity cultvars Bashu No. 10 and Wumeng 851 as experimental materials, we studied the effects of drought on potato crop. The results obtained were as follows. (1) With period and intensity of water stress increasing, the leaf relative water content, feat water potential, leaf transpiration intensity, root bleaching amount, plant height, stem thickness, leaf length and width, functional leafspacing, tuber yield per plant and harvest index were all decreased, but dry matter content in tuber increased. As for the total chlorophyll content and photosynthesis intensity, they were decreased with the period of water stress increasing while they were increased with the intensity of water stress increasing. (2) The tuber yield per plant was positively correlated to leafwater potential and harvest index (P <0.05), but negatively correlated to dry matter contentin tuber (P < 0.05). (3) The cultivars, Bashu No. 9 and Wumeng 851, seemed to be insensitivetO drought.