Effect of Bentazon, a Hill Reaction Inhibitor, on Symbiotic Nitrogen-fixing Capability and Apparent Photosynthesis.
Effect of Bentazon, a Hill Reaction Inhibitor, on Symbiotic Nitrogen-fixing Capability and Apparent Photosynthesis.
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希尔反应抑制剂苯达松对共生固氮能力和表观光合作用的影响。
DOI：
10.1104/pp.63.1.213
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发表时间：
1979
期刊：
影响因子：
7.4
通讯作者：
D. Phillips
中科院分区：
文献类型：
--
作者：
G. Bethlenfalvay;R. Norris;D. Phillips
大豆植物（Phaseolus vulgaris L. cv.）的共生关系。采用Hill反应抑制剂苯达松（3-异丙基-1 h -2,1,3-苯并噻二嗪-4-(3H)- 1 -2,2-二氧化氮）处理蓝湖菌和相绿根瘤菌127K17。通过测量C(2)H(2)生成和H(2)演化以及CO(2)交换速率，研究了每隔6小时对叶片和根系施用1.8 kg /公顷苯达松的植物进行N(2)固定能力测定。在叶面处理的植株中，CO(2)交换速率和N(2)固定能力的最大抑制分别发生在处理后6和12小时。在根处理的植株中，这两个过程的最大抑制延迟了6小时，并且比叶处理的植株的抑制程度要轻。所有植物的固氮能力和CO(2)交换速率恢复到控制水平。应用较高速率的苯他松对CO(2)交换速率和N(2)固定能力有较大的抑制作用。两个过程的抑制率呈正相关（r = 0.985）。结果表明，苯达松对氮(2)固定能力的抑制不是直接引起的，而是通过限制光合产物支持根瘤活性的有效性间接引起的。
Symbiotic associations of bean plants (Phaseolus vulgaris L. cv. Blue Lake) and Rhizobium phaseoli strain 127K17 were treated with the Hill reaction inhibitor bentazon (3-isopropyl-1 H-2,1,3-benzothiadiazin-4-(3H)-one-2,2-dioxide). Plants receiving foliar and root treatments of 1.8 kilograms per hectare bentazon were assayed at 6 hour intervals for N(2)-fixing capacity by measuring C(2)H(2)-dependent C(2)H(4) production and H(2) evolution and for CO(2) exchange rates. In foliar treated plants greatest measured inhibition of CO(2) exchange rates and N(2)-fixing capacity occurred 6 and 12 hours after treatment, respectively. In root-treated plants maximum inhibition of both processes was delayed by 6 hours, and was less severe than in foliar treated plants. Nitrogen-fixing capacity and CO(2) exchange rate recovered to control levels in all plants. Application of higher rates of bentazon resulted in greater inhibition of CO(2) exchange rate and N(2)-fixing capacity. Inhibition of the two processes was positively correlated (r = 0.985). The results indicate that inhibition of N(2)-fixing capacity was not caused by bentazon directly, but indirectly through limiting the availability of photosynthate to support root nodule activity.