Variation in plant hormone system [rice; tobacco; coconut]
1985
Alejar, J.A. | Erasga, A.B. | Faulve, M.B. (University of the Philippines at Los Banos, College, Laguna. Dept. of Botany)
Higher level of abscisic acid (ABA) was associated with cultivars of salt-sensitive rice, drought susceptible tobacco and drought sysceptible coconut. There was no difference in the amount of ABA in tungro-susceptible or tungro-resistant rice cultivars. Analysis of indoleacetic acid (IAA) showed no definite trend related to salt or tungro-tolerance in rice. When tissues of rice were exposed to salt or disease stress, ABA accumulation was observed for the susceptible varieties while increased IAA levels were only observed in the tungro-infected susceptible cultivar. Buds taken from potato tubers 21 days after lifting showed no difference in the ABA and gibberellic acid (GA) content among the different cultivars. However, the mean value for buds from the two representative short-dormancy-period cultivars contain the least amount of GA and ABA. This same group was also found to contain the highest IAA content. On the other hand, the long dormancy-period gave the highest cytokinin (CK) level while the medium-dormancy-period ones contain the lowest amount of IAA and CK
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