EFFECT OF CO2 ENRICHMENT ON ROOT NODULE DEVELOPMENT AND SYMBIOTIC N2 REDUCTION IN PISUM-SATIVUM-L
EFFECT OF CO2 ENRICHMENT ON ROOT NODULE DEVELOPMENT AND SYMBIOTIC N2 REDUCTION IN PISUM-SATIVUM-L
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DOI：
10.2307/2441581
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发表时间：
1976-01-01
影响因子：
3
通讯作者：
FELLING, CE
中科院分区：
文献类型：
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作者：
PHILLIPS, DA;NEWELL, KD;FELLING, CE
P. sativum L.当植物在具有6小时CO2富集（0.00120大气压）的光照下生长时，发生豆类根瘤菌感染。在0.00120大气压CO2下生长4周的植物在0.00032大气压CO2下比对照植物在植物干重、N含量、根瘤质量、根瘤数和平均根瘤干重方面表现出显著的增加。然而，乙炔还原试验表明，长期CO2富集的植物固氮酶活性/mg根瘤没有可重复的增加。无论是控制和CO2富集的植物优化的汇/源之间的比例的质量的结节和adjuncodular植物质量。4周龄豌豆减少N2的最佳比例为0.05。长期的CO2富集并没有促进根瘤的形成，以更大的程度比总植物的发展，并在氮含量的增加成正比的结节质量的增加。形态学数据显示显着更大的沉积物的淀粉在根瘤中生长的植物在CO2富集条件下。结果被解释为表明，短期增加CO2水平促进N2减少影响根瘤功能，而长期CO2富集促进N2减少增加总植物和根瘤的发展。
A very significant increase in N2(C2H2) reduction by P. sativum L. infected with Rhizobium leguminosarum occurred when plants were grown in the light with 6 h of CO2 enrichment (0.00120 atm). Plants grown for 4 wk under 0.00120 atm CO2 showed significant increases over control plants at 0.00032 atm CO2 in plant dry weight, N content, root nodule mass, number of nodules and mean nodule dry weight. Acetylene-reduction assays, however, revealed no reproducible increase in nitrogenase activity/mg nodule in plants subjected to long-term CO2 enrichment. Both control and CO2-enriched plants optimized the sink/source ratio between the mass of nodules and the extranodular plant mass. The optimum ratio for N2 reduction by 4-wk-old peas was 0.05. Long-term CO2 enrichment did not promote root nodule formation to a greater degree than total plant development, and increases in N content were directly proportional to increases in nodule mass. Morphological data revealed significantly greater deposits of starch in root nodules of plants grown under CO2-enriched conditions. The results are interpreted as showing that short-term increases in CO2 levels promote N2 reduction by affecting root nodule functioning, whereas long-term CO2 enrichment promotes N2 reduction by increasing total plant and root nodule development.