PHOTOSYNTHETIC PHOTORESPIRATORY CARBON METABOLISM IN THE C-3-C-4 INTERMEDIATE SPECIES, MORICANDIA-ARVENSIS AND PANICUM-MILIOIDES
PHOTOSYNTHETIC PHOTORESPIRATORY CARBON METABOLISM IN THE C-3-C-4 INTERMEDIATE SPECIES, MORICANDIA-ARVENSIS AND PANICUM-MILIOIDES
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DOI：
10.1104/pp.73.3.740
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发表时间：
1983-01-01
期刊：
影响因子：
7.4
通讯作者：
CHOLLET, R
中科院分区：
文献类型：
--
作者：
HOLADAY, AS;CHOLLET, R
研究了14 C在2种光呼吸减弱的高等植物光合代谢产物中的分布。arvensis和P. milioides在脉冲和脉冲追踪CO_2掺入实验中与C_3物种M相似。foetida和Glycine max.在14 CO2掺入6s后，在两种M中，只有约6%的总14 C固定在苹果酸和天冬氨酸中。arvensis和P. milioides。C4酸的表观周转非常缓慢，苹果酸在M.阿文西斯因此，M.在实验条件下（310 μ l CO2/l，21%O2，1100或1900 μ l CO2/l，1000或1000 μ l O2/l），野生稻和粟粒稻在光合作用碳同化中没有显著作用。分子光子/m2/S，27 ° C。C）。在含有270 μ l CO2/l的空气中36秒的追踪期后，固定的总14 C的约20%在甘氨酸中，M. arvensis，而M. foetida、粟粒拟青霉、G.最大在100 NB μ l CO2/l中36秒的追踪期后，在C3物种和粟粒拟青霉中，甘氨酸中的百分比约为270 NB μ l CO2/l时的两倍，但在M中甘氨酸中的14 C仅多20%。阿文西斯M. arvensis的甘氨酸表观周转率和光呼吸过程中C向甘氨酸的流动量在M.阿文西斯M. arvensis可能与该十字花科植物的光呼吸减少机制有关。
The distribution of 14C in photosynthetic metabolites of 2 naturally occurring higher plants with reduced photorespiration, M. arvensis and P. milioides, in pulse and pulse-chase CO2 incorporation experiments was similar to that for the C3 species M. foetida and Glycine max. After 6 s of 14CO2 incorporation, only about 6% of the total 14C fixed was in malate and aspartate in both M. arvensis and P. milioides. The apparent turnover of the C4 acids was very slow, and malate accumulated during the day in M. arvensis. Thus, C4 acid metabolism by M. arvensis and P. milioides had no significant role in photosynthetic carbon assimilation under the conditions of the experiments (310 .mu.l CO2/l, 21% O2, 1100 or 1900 .mu. molphoton/m2 per S, 27.degree. C). After a 36-s chase period in air containing 270 .mu.l CO2/l, about 20% of the total 14C fixed was in glycine with M. arvensis, as compared to 15% with M. foetida, 14% with P. milioides, and 9% with G. max. After a 36-s chase period in 100 NB .mu.l CO2/l, the percentage in glycine was about twice that at 270 NB .mu.l CO2/l, in the C3 species and P. milioides, but only 20% more 14C was in glycine in M. arvensis. Either the photorespiratory glycine pool in M. arvensis is larger than in the other species examined or the apparent turnover rate of glycine and the flow of C into glycine during photorespiration are less in M. arvensis. An unusual glycine metabolism in M. arvensis may be linked to the mechanism of photorespiratory reduction in this crucifer.