Browsing by Author "Patil, K.D."

Now showing 1 - 16 of 16
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    Abnormal Stomatal Opening in Coconut Palms Affected with Root (Wilt) Disease
    (1986-09) Rajagopal, V.; Patil, K.D.; Sumathy Kutty Amma, B.
    Rajagopal, V., Patil, K. D. and Sumathykuttyamma, B. 1986. Abnormal stomatal opening in coconut palms affected with root (wilt) disease.—J. exp. Bot. 37: 1398-1405. Studies on the stomatal regulation in the root (wilt) affected coconut palms (Cocos nucifera L.) revealed that the diseased palms had low stomatal resistance compared to the healthy palms, irrespective of their age. The same trend was observed whether the determinations were made at different times of the day (6-18 h) or under irrigated and unirrigated conditions or in different seasons (dry and wet). Thus, the stomatal regulation was significantly impaired in the diseased palms resulting in excessive water loss compared to the healthy palms. Results are discussed with the available literature on other similar disease caused by fungi, bacteria and mycoplasma-like organisms in different plants.
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    Abnormal Stomatal Opening in Coconut Palms Affected with Root (Wilt) Disease
    (2007-02-08) Rajagopal, V.; Patil, K.D.; Sumathy Kutty Amma, B.
    Studies on the stomatal regulation in the root (wilt) affected coconut palms (Cocos nucifera L.) revealed that the diseased palms had low stomatal resistance compared to the healthy palms, irrespective of their age. The same trend was observed whether the determinations were made at different times of the day(6 18 h) or under irrigated and unirrigated conditions or in different seasons (dry and wet). Thus, the stomatal regulation was significantly impaired in the diseased palms resulting in excessive water loss compared to the healthy palms. Results arc discussed with the available literature on other similar disease caused by Fungi, bacteria and mycoplasma-like organisms in different plants.
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    An attempt to regenerate roots in root (wilt) affected coconut palms by hormones, phenols and amino acids
    (2007-02-08) Sumathy Kutty Amma, B.; Patil, K.D.
    The root (wilt) of coconut. Is a disease of unknown the etiology, and of con-sidersble economic importance to Kerala. Root decay It a common phenomenon associ-ated with root (wilt) disease wherein 12 to 90% root rotting has been reported in diseased palms. A study was therefore conducted to induce root production In root (wilt) affected coconut palms and to regenerate the damaged root system. Root (wilt) diseased middle aged pelms were used for this study. Growth hormones IBA and NAA, pehnols and amino acids In different concentrations singly and In combinations were applied by the lanolins pasta method to the base of the stem (near bole region) after debarking the same at ground level. The points of application were then covered with soil which was kept moist during the rainless period by water-Ing. Root initiation was observed between six months to one year after treatment. The palms which .received the treatment IBA 500 ppm + phenols 400 ppm each, produced the maximum number of roots. The next effective treatment was found to be NAA 500 ppm + Glutamic acid 500 ppm.
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    Efficacy of management practices for increasing the productivity of root (wilt) affected coconut palms
    (1987-12) Rajagopal, V.; Patil, K.D.; Sumathy Kutty Amma, B.
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    Efficacy of management practices for increasing the productivity of root (wilt) affected coconut palms
    (2007-02-08) Rajagopal, V.; Patil, K.D.; Sumathy Kutty Amma, B.
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    In Vivo Nitrate Reductase Activity In The Leaves Of Apparently Healthy And Root (Wilt) Affected Coconut Palms
    (2007) Rajagopal, V.; Patil, K.D.; Amma, B.S.K.
    The in vivo nitrate reductase activity (NRA) was studied in apparently healthy and root (wilt) diseased coconut palms. The enzyme activity was more in the leaves of the middle whorl, followed by those of the outer whorl, than either in the spindle leaf or the first fully open leaf. In all the leaves studied, the diseased palms had higher activity than in the apparently healthy palms. The enzyme activity was influenced by the light intensity. Irrespective of the palm condition the NRA was higher at high light intensity (1250 to 1400µE m-2s-1) than that at low light intensity (250 to 500/iE tn-s1). Again, the activity of enzyme in apparently healthy palms was less than that in the diseased palms. With increase in the level of nitrogen application there was increase in NRA both in apparently healthy and diseased palms, the latter recording relatively high activity. The response of palms to simulated stress indicated that the enzyme was adversely affected in both the palms. The study thus revealed disturbed nitrogen metabolism caused by the root (wilt) disease.
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    Leaf Characteristics And Dry Matter Production In Coconut (WCT And CDO X T) Grown Under Conditions Of Low And High Drought Intensities
    (1986-05) Rajagopal, V.; Kasturi Bai, K.V.; Ramadasan, A.; Balasimha, D.; Voleti, S.R.; Patil, K.D.; Sumathy Kutty Amma, B.; Varkey, T.; Mathew, A.S.; Gopalakrishnan Nair, M.
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    Pectin Lyase Activity in the Roots of Root (wilt) Disease Affected Coconut Palm
    (2007-02) Sumathy Kutty Amma, B.; Patil, K.D.
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    Physiological Studies on Root(Wilt) Diseased Coconut Palms Under Different Management Practices
    (1989) Rajagopal, V.; Patil, K.D.; Mathew, C.; Sumathy Kutty Amma, B.
    Studies were undertaken in farmers fields on root (wilt) diseased coconut palms maintained under well managed, moderately managed and poorly managed conditions. Physiomorphological characters and disease index were recorded at half yearly intervals for five years. Diseased palms responded markedly to good management, as indicated by a decline in disease index (40% improvement over pre-treatment conditions). The overall improvement was brought about by decrease in the intensity of flaccidity symptom, enhanced greenness of leaves, reduction in leaf rot and necrosis and a fall in the rate of leaf senescence. There was only marginal improvement in palms under moderately managed conditions, while those under poor management had greater tendency of deterioration. The efficacy of scientific management practices in the root(wilt) affected garden is highlighted.
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    The Root (Wilt) Problem of Coconut - A Physiological Approach
    (1982-01) Patil, K.D.; Chacko Mathew
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    The Root (Wilt) Problem Of Coconut A Physiological Approach
    (1982) Patil, K.D.; Chacko Mathew
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    Stem Bleeding Disease Of Coconut In Kerala
    (1985) Lily, V.G.; Patil, K.D.
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    Studies on Water Uptake by Root(Wilt) Diseased Coconut Palms
    (1986) Rajagopal, V.; Chacko Mathew; Patil, K.D.; Jose Abraham
    Investigations were carried out to study the uptake of water by the roots of apparently healthy and root (wilt) - affected coconut palms (Cocos nucifera L.). Feeding the cut end of roots with water indicated that diseased palms have lesser uptake than the healthy palms. Irrigating the palms during summer had beneficial effect on water uptake through roots of different maturity and by roots of healthy and diseased palms. Estimation of soil moisture content at different profiles in the basins of apparently healthy and diseased palms at one day interval for five days after irrigation indicated that the former" had greater depletion of water than the latter. These results show that the root system of diseased palms is adversely affected.
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    Studies On Water Uptake By Root(Wilt) Diseased Coconut Palms
    (1986) Rajagopal, V.; Chacko Mathew; Patil, K.D.; Jose Abraham
    Investigations were carried out to study the uptake of water by the roots of apparently healthy and root (wilt) - affected coconut palms (Cocos nucifera L.). Feeding the cut end of roots with water indicated that diseased palms have lesser uptake than the healthy palms. Irrigating the palms during summer had beneficial effect on water uptake through roots of different maturity and by roots of healthy and diseased palms. Estimation of soil moisture content at different profiles in the basins of apparently healthy and diseased palms at one day interval for five days after irrigation indicated that the former" had greater depletion of water than the latter. These results show that the root system of diseased palms is adversely affected.
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    Water Relations of Coconut Palms affected with Root (Wilt) Disease
    (1987) Rajagopal, V.; Sumathy Kutty Amma, B.; Patil, K.D.
    The water relations of apparently healthy and root (wilt)-diseased coconut palms (Cocos nucifera L.) were investigated. Leaves of diseased palms had lower stomatal resistances (with relatively high transpiration rates) and leaf water potentials than apparently healthy palms. Although there was a small reduction of osmotic potential in leaves of diseased palms, there was almost complete loss of turgor potential, and flaccidity resulted.