Contribution of momilactone A and B to rice allelopathy
Contribution of momilactone A and B to rice allelopathy
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DOI：
10.1016/j.jplph.2010.01.014
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发表时间：
2010-01-01
影响因子：
4.3
通讯作者：
Kujime, Hiroya
中科院分区：
文献类型：
--
作者：
Kato-Noguchi, Hisashi;Hasegawa, Morifumi;Kujime, Hiroya
对8个水稻品种（Oryza sativa L.）在生物测定培养基中，当与水稻幼苗共培养时，抑制稗草的芽和根的生长。在所有水稻品种的生物测定培养基中均检测到了豆蔻内酯A和B，其浓度分别为0.21-1.5和0.66-3.8 μ mol/L，表明所有水稻品种都能分泌豆蔻内酯A和B。外施豆蔻内酯A和B对E.浓度分别大于30和1 μ mol/L的crus-galli。50%抑制E.绿豆内酯A和绿豆内酯B分别为146和91 μ mol/L和6.5和6.9 μ mol/L。考虑到在生物测定培养基中发现的生长抑制活性和浓度，毛霉内酯A可能仅引起所观察到的E.水稻根、茎、芽等。然而，据估计，培养基中的momilactone B能够引起所观察到的E.水稻幼苗的根状茎和芽。此外，在培养基中的momilactone B的浓度反映了在E. 8个水稻品种对稻曲病的影响。这表明水稻的化感活性可能主要取决于豆蔻内酯B的分泌水平。因此，豆蔻内酯B可能在水稻化感作用中起重要作用。(C)2010年Elsevier GmbH。All rights reserved.
Eight cultivars of rice (Oryza sativa L.) inhibited shoot and root growth of Echinochloa crus-galli when co-cultured with rice seedlings in a bioassay medium. Momilactone A and B were found in the bioassay medium of all rice cultivars, and concentrations of momilactone A and B in the medium were 0.21-1.5 and 0.66-3.8 mu mol/L, respectively, indicating that all rice cultivars may secrete momilactone A and B into the medium. Exogenously applied momilactone A and B inhibited the growth of shoots and roots of E. crus-galli at concentrations greater than 30 and 1 mu mol/L, respectively. The concentrations required for 50% growth inhibition of E. crus-galli shoots and roots, respectively, were 146 and 91 mu mol/L for momilactone A and 6.5 and 6.9 mu mol/L for momilactone B. Considering the growth inhibitory activity and concentrations found in the bioassay medium, momilactone A may have caused only 0.8-2.2% of the observed growth inhibition of E. crus-galli roots and shoots by rice. However, momilactone B in the medium was estimated to be able to cause 59-82% of the observed growth inhibition of E. crus-galli roots and shoots by the rice seedlings. In addition, the concentrations of momilactone B in the medium reflected the observed differences in the growth inhibition of E. crus-galli by the eight rice cultivars investigated. This suggests that the allelopathic activity of rice may depend primarily on the secretion level of momilactone B. Therefore, momilactone B may play a very important role in rice allelopathy. (C) 2010 Elsevier GmbH. All rights reserved.