厚皮甜瓜苗期叶片光合、光呼吸及暗呼吸速率的变化  

Study on Change Rule of photosynthetic rate,photo respiration rate and dark respiration rate of muskmelon leaves during seedling

作　　者：李建斌[1] 李建明[1] 邹志荣[1] 黄志[1] 

机构地区：[1]西北农林科技大学园艺学院,陕西杨凌712100

出　　处：《西北农林科技大学学报（自然科学版）》2008年第7期57-63,共7页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家"十一五"科技支撑计划(2007BAD79B4)

摘　　要：【目的】探讨厚皮甜瓜苗期叶片光合作用、光呼吸及暗呼吸受环境条件影响的变化规律。【方法】在田间不同天气（晴天和阴天）及室内不同温度处理下，测定厚皮甜瓜幼苗生长发育过程中不同叶片的净光合速率、光呼吸速率和暗呼吸速率，分析其变化规律及不同叶片光呼吸系数和暗呼吸系数。【结果】阴天厚皮甜瓜幼苗叶片净光合速率、光呼吸速率及暗呼吸速率均为单峰型曲线，在10：00～12：00时达到峰值；晴天则表现为双峰型曲线，不同叶片以上3个指标最高峰值出现时间不同。在出苗后的前12d，子叶净光合速率大于第一片真叶，之后第一片真叶净光合速率大于子叶。温度对厚皮甜瓜幼苗叶片净光合速率的影响为正弦函数曲线。温度小于6．5℃或大于46℃时对净光合速率影响系数均为0，在28℃时对净光合速率影响系数达到最大。在25℃时厚皮甜瓜叶片白天的光呼吸系数和暗呼吸系数分别为0．17和0．21。【结论】甜瓜幼苗叶片净光合速率、光呼吸速率及暗呼吸速率随着叶龄、叶片类型及环境条件的变化而变化，子叶和真叶的变化规律存在差异。[Objective] The study probed into the change rule of leaf photosynthesis and leaf photo respiration and dark respiration with environment. [Method] photosynthetic rate, leaf photo respiration rate, and dark respiration rate were measured for different leaves at different climate and temperature treat- ments, and those change rules and coefficients of photo respiration and dark respiration were analyzed for different leaves. [Result] The results show that, it was single peak style curve in cloudy day and double peak style curve in sunny day for dairy change of leaf photosynthetic rate and photo respiration rate and dark respiration rate. The maximum value of the peak was at AM 10--12 on cloudy day,but the peak＇s time was different with different leaves on sunny days. The photosynthetic rate value of cotyledon was bigger than the first leaf 12 days after sowing,but then reversed. It was a sin function for the temperature effect on the photosynthesis. The photosynthesis rate valued was zero when temperature was lower than 6.5 ℃ or higher than 46 ℃. The maximum value of photosynthesis was at 28℃. Coefficient of leaf photo respiration and dark respiration was 0.16 and 0.20 respectively at 25 ℃. [Conclusion] Muskmelon seedling leaf photosynthesis, leaf photo respiration and dark respiration ment,and the changing rules for cotyledon and leaves were different.

关 键 词：甜瓜 光合作用 光呼吸 暗呼吸 

分 类 号：S652.9[农业科学—果树学]