COMPENSATORY RESPONSE OF A LEGUME ROOT-NODULE SYSTEM TO NODULE HERBIVORY BY SITONA-HISPIDULUS
COMPENSATORY RESPONSE OF A LEGUME ROOT-NODULE SYSTEM TO NODULE HERBIVORY BY SITONA-HISPIDULUS
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DOI：
10.1111/j.1570-7458.1992.tb01606.x
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发表时间：
1992-08-01
影响因子：
1.9
通讯作者：
HALL, MH
中科院分区：
文献类型：
--
作者：
QUINN, MA;HALL, MH
通过实验室研究，验证了豆科植物固氮根瘤的植食性引起根瘤生长的精确补偿反应的假说。紫花苜蓿（Medicago sativa（L.）水培生长在透明的塑料生长袋，使根瘤的数量和生物量可以估计非破坏性的前，10和18天后，部分去结。对于处理，植物经受由Sitona hispidulus（F.）（苜蓿和三叶草的常见食草动物）或50%根瘤修剪;另外的植物不处理。结果表明，根瘤植食和根瘤修剪引起了根瘤数量的超补偿反应。在去结后10天，每株植物的结核单位数（结核生物量的间接测量）也是如此，但到第18天，已变为精确的补偿反应。结核单位数量的变化与结核初始数量之间的反比关系表明，补偿性生长受反馈机制的调节。在这项研究中，地上部和根的生物量没有受到影响。
A laboratory study was conducted to examine the hypothesis that herbivory of nitrogen-fixing root nodules on legumes causes an exact compensatory response in nodule growth. Plants of Medicago sativa (L.) were grown hydroponically in clear plastic growth pouches so that the number and biomass of root nodules could be estimated nondestructively before, and 10 and 18 days after, partial denodulation. For treatments, plants were subjected to 23% denodulation by first-in star larvae of Sitona hispidulus (F.) (a common herbivore of Medicago and Trifolium) or 50% nodule pruning; additional plants were left untreated. Results indicated that nodule herbivory and nodule pruning caused an overcompensatory response in number of nodules. This was also true for number of nodule units (an indirect measure of nodule biomass) per plant at 10 days after denodulation but had changed to an exact compensatory response by day 18. An inverse relationship between change in number of nodule units and initial number of nodules indicated that compensatory nodulation was regulated by a feedback mechanism. Shoot and root biomasses were not affected by denodulation in this study.