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Effect of morphactin, AMO-1618 and DPX-1840 on the endogenous levels of hormones and its implication on apical dominance inGlycine max Linn.

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Proceedings / Indian Academy of Sciences

Abstract

Application of morphactin,AMO-1618 andDPX-1840 to 20 day old plants of soybean caused the sprouting of almost all lateral buds. However, the follow-up growth of newly ensued buds was manifested only with morphactin and not withAMO-1618 orDPX-1840. The quantitative estimations of growth promoters, carried out 20 days after the application of inhibitors, revealed that the possible mechanism through which these substances exerted their influence on apical dominance varied with the type of regulator. It appeared that morphactin lifted the apical dominance mainly through the increase in endogenous levels of cytokinin and partly through lowering the levels of auxins.AMO-1618 checked the gibberellin turnover whiledpx-1840 suppressed significantly the levels of auxins. The data show that apical dominance and not the subsequent growth of newly evocated buds is regulated by the ratio of cytokinins (CK) to auxins (Au) plus gibberellins (GA) and any factor(s) which enhance(s)CK (like morphactin) or suppress(es)GA (likeAMO-1618) or Au (likeDPX-1840 or morphactin) would play a key role in the abolition of apical dominance.

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  1. Department of Botany, Panjab University, 160 014, Chandigarh, India

    I S Dua, U K Kohli & K S Chark

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  1. I S Dua
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  2. U K Kohli
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  3. K S Chark
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Dua, I.S., Kohli, U.K. & Chark, K.S. Effect of morphactin, AMO-1618 and DPX-1840 on the endogenous levels of hormones and its implication on apical dominance inGlycine max Linn.. Proc. Indian Acad. Sci. 91, 501–508 (1982). https://doi.org/10.1007/BF03052970

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