Response of two pea hybrids to CO2 enrichment: a test of the energy overflow hypothesis for alternative respiration.

Response of two pea hybrids to CO2 enrichment: a test of the energy overflow hypothesis for alternative respiration.
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两种豌豆杂交品种对二氧化碳富集的响应:替代呼吸能量溢出假说的检验。

DOI:
10.1073/pnas.83.21.8157
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发表时间:
1986
影响因子:
11.1
通讯作者:
Siedow,JN
Siedow,JN
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Musgrave,ME;Strain,BR;Siedow,JN

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两个豌豆(Pisum sativum L.)通过与CV.阿拉斯加和CV。第9号进展。F1杂种生长在温室中保持在350或650 ppm CO2,生长,开花,干物质积累进行了比较。目的是评估替代呼吸途径对全植物碳收支的重要性,并进一步检验替代途径在氧化过量碳水化合物(例如可能在CO2富集条件下积累的碳水化合物)方面很重要的假设。更多的碳水化合物可在F1杂交缺乏的途径,证明了更大的株高,叶面积,比叶重,和总干物质相比,互惠杂交,特别是在650 ppm CO2。在缺乏该途径的杂交种中,CO2浓度升高使比叶重显著增加,而在350和650 ppm的正反交中,比叶重增加的趋势相同。在总干物质和种子产量方面,缺乏替代途径的杂交种也优于正反交。在缺乏该途径的杂交种中观察到随着CO2富集而增加的分支,而在互交中的分支仅受到轻微刺激。这些结果表明,交替呼吸消耗奢侈的碳水化合物和呼吸通过这一途径可能被认为是能量浪费的全植物碳预算。
Two pea (Pisum sativum L.) hybrids differing in the presence or absence of the cyanide-resistant (alternative) pathway of respiration were constructed by reciprocally crossing cv. Alaska and cv. Progress No. 9. The F1 hybrids were grown in greenhouses maintained at either 350 or 650 ppm CO2, and the growth, flowering, and dry matter accumulation were compared. The objective was to assess the significance of the alternative respiratory pathway to whole-plant carbon budgets and further to test the hypothesis that the alternative pathway is important in oxidizing excess carbohydrates such as might accumulate under conditions of CO2 enrichment. More carbohydrates were available in the F1 hybrid lacking the pathway, as evidenced by greater plant height, leaf area, specific leaf weight, and total dry matter compared with the reciprocal hybrid, especially at 650 ppm CO2. Specific leaf weight increased markedly under CO2 enrichment in the hybrid lacking the pathway, while it was the same at 350 and 650 ppm in the reciprocal cross. The hybrid lacking the alternative pathway also outperformed the reciprocal cross in terms of total dry matter and seed production. Increased branching with CO2 enrichment was observed in the hybrid lacking the pathway, while branching in the reciprocal cross was only slightly stimulated. These results suggest that alternative respiration consumes luxury carbohydrate and that respiration via this pathway may be considered energetically wasteful in terms of whole-plant carbon budgets.
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