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Theses

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1981 - 19832
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Subject: Plant Physiology × Author: KAU × End date: 1989 × Start date: 1981 × Type: Thesis ×
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    ThesisItemOpen Access
    Studies on the physiological and biochemical changes in relation to reproductive efficiency in Chickpea (Cicer arietinum L.)
    (Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, 1981) Seshadrinath, S; KAU; Sabra Abbas
    The average yield of chickpea in India is as low as 700 kg/ha. One of the major causes for this low yield can be attributed to the low reproductive efficiency. The cause for low reproductive efficiency is mainly due to heavy shedding of reproductive structures. The present investigations were, therefore, initiated with the following objectives: 1) To study the genetic variability and diversity with reference to the flowering behaviour and shedding of flowers during the reproductive stage in order to evaluate the peak periods of flowering, shedding percentage and reproductive efficiency.
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    ThesisItemOpen Access
    Physiological and biochemical basis of degeneration in Root (Wilt) affected coconut palm
    (Department of Agricultural Botany, College of Agriculture, Vellayani, 1983) Sheela Cherian; KAU; Abraham, A T
    Several studies on the physiological and biochemical aspect of the root (wilt) disease have been carried out and conclusions have been drawn. A recent study comprising o f the estimation of protein non protein amino acids and cytokinin from the leaf, root and developing nut o f healthy# apparently healthy and root (wilt) affected coconut palm was carried out in tills, laboratory (unpublished). The chlorophyll content of leaves was also estimated. The present study comprised o f estimation o f gibberellin s and abscissic acid from the leaf# root and nut of healthy apparently healthy and five different intensities of root (wilt) affected coconut palms. The results of the biochemical analysis show that in the root (wilt) affected coconut palms there are alterations or deviations in normal metabolic activities from that o f healthy palms. Earlier work done has shown a reduction in cytokinin content in the root(wilt) affected palm in addition to protein and chlorophyll content. The present study has revealed a deficiency of gibberellins another important growth regulator and an accumulation of the growth inhibitor abscissic acid in the root(wilt) affected palms. The site s of synthesis and / interconversion o f gibberellins are damaged together with the impairment o f the translocation system. Increased respiration lowered CO2 fixation and severe damage o f the shoot system in the later stages are in brief the in tern al and external expressions o f the root (wilt) syndrome. Thus the shoot and root system which are interdependant are unable to function in harmony leading to a failure in their growth and development. An accumulation of ABA along with a reduction in gibberellin level might be the reason for the stunting syndrome seen in root(wilt) affected palms.