论文部分内容阅读
以大白菜‘鲁白８号’两亲本为试材研究小株采种种株的光合特性，结果表明：种株功能叶片光合速率为ＣＯ２１０～１６μｍｏｌ·ｍ－２·ｓ－１；最大光合速率出现于开花期；种株叶片光合速率日变化常呈双峰曲线，中午降低；单叶光合能力大小受叶龄叶位影响显著；盛花期种株的光补偿点和光饱和点分别为２５～３２μｍｏｌ·ｍ－２·ｓ－１和９５０～１０００μｍｏｌ·ｍ－２·ｓ－１，ＣＯ２补偿点和饱和点分别为５５～６０μＬ·Ｌ－１和１２００～１４００μＬ·Ｌ－１；气温高于３０℃或叶片相对含水量低于７７％时光合速率下降，轻度水分胁迫下为气孔限制，严重水分胁迫下为非气孔限制；叶片、茎枝、角果均具有同化固定ＣＯ２能力，以叶片最强，茎枝最弱，茎枝和角果分别为叶片的１１％～１２％和２０％～４０％。
The photosynthetic characteristics of Chinese cabbage ’Lu Bai 8’ were studied with photosynthetic characteristics of the plants. The results showed that the photosynthetic rate of functional leaves was CO210 ~ 16μmol · m-2 · s-1 and the maximum photosynthetic rate The diurnal changes of photosynthetic rate of seedling leaves often showed a bimodal curve at midday, and the photosynthetic abilities of single leaf were significantly affected by leaf position. The light compensation points and light saturation points of full bloom were 25 ~ 32μmol · The CO2 compensation point and saturation point were 55-60 μL·L-1 and 1200-1,400 μL·L-1 respectively at m-2 · s-1 and 950-1000 μmol · m-2 · s-1. The temperature was higher than 30 ℃ or Photosynthetic rate decreased when the relative water content was less than 77%, stomatal limitation under mild water stress and non-stomatal limitation under severe water stress. The ability of assimilation and fixation of CO2, Stems weakest, stems and pods were leaves of 11% to 12% and 20% to 40%.