• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Experimental Botany >Leaf succulence determines the interplay between carboxylase systems and light use during Crassulacean acid metabolism in Kalanchoë species*
【24h】

Leaf succulence determines the interplay between carboxylase systems and light use during Crassulacean acid metabolism in Kalanchoë species*

机译：在Kalanchoë物种的Crassulacean酸代谢过程中，叶片的多汁性决定了羧化酶系统与光利用之间的相互作用*

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The photosynthetic physiology of Crassulacean acid metabolism was investigated in two Kalanchoë species with differing leaf succulence. The magnitude of CAM was higher for the more succulent leaves of K. daigremontiana, compared to the less succulent leaves of K. pinnata. High succulence was related to low mesophyll conductance: K. pinnata was able to maximize diurnal carbon gain by the C3 pathway, whereas increased succulence is associated with a higher commitment to the CAM cycle in K. daigremontiana. The Rubisco specificity factor, τ, determining selectivity for CO2 over O2, was similar for both species (∼88), and lower than that of Spinacea (∼95), but in contrast to C4 plants, the Rubisco KmCO2 (determined independently) was also lower in Kalanchoë spp. than in spinach. Differences in light use were related to the nature of the sink strength in each Phase of CAM, with PEPC activity resulting in low electron transport rates. Decarboxylation was marked by high, non-saturated rates of electron transport, with Rubisco activity and activation state increasing in both species during the course of the light period. The degree of succulence, and extent of CAM activity, was associated with a progressive inhibition of PSII photochemistry and potential Rubisco activity during the night in both species. Rubisco could be ‘woken up’ more rapidly in K. pinnata, whereas 45 min light acclimation was required for full recovery of electron transport and Rubisco activity in K. daigremontiana. Leaf morphology therefore seems to alter the expression of and dependence on CAM, but also the extent of co-regulation of carboxylase networks and light use capacity.
机译：研究了两种具有不同叶片多肉性的Kalanchoë物种的Crassulacean酸代谢的光合生理。与多羽红松叶片的多肉叶片相比，多角松叶片的多肉叶片的CAM含量更高。肉质高与叶肉电导率低有关：羽衣甘蓝通过C 3 途径能够最大程度地提高昼夜碳的吸收，而肉质的增加与对白花甘蓝的CAM循环的更高承诺有关。 Rubisco特异性因子τ决定了CO 2 对O 2 的选择性，在两个物种中均相似（〜88），但比菠菜（〜95）低。但是，与C 4 植物相反，Kalanchoëspp的Rubisco K mCO 2 （独立确定）也较低。比菠菜光使用的差异与CAM的每个相的吸收强度的性质有关，PEPC活性导致电子传输速率低。脱羧的特征在于高的非饱和电子传输速率，在光照期间，两种物种的Rubisco活性和活化态均增加。在两个物种中，肉质的程度和CAM活性的程度都与PSII光化学的逐步抑制和夜间Rubisco活性有关。羽衣甘蓝中Rubisco的“唤醒”速度可能更快，而在daigremontiana中，电子迁移和Rubisco活性的完全恢复需要45分钟的光照适应。因此，叶片形态似乎改变了CAM的表达和依赖性，但也改变了羧化酶网络和光利用能力的共同调节程度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号