Browsing by Author "Sumathy Kutty Amma, B."
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Item 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.Item 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.Item Alterations in the leaf protein content of coconut affected by root (wilt) disease(2007-02-08) Padmaja, G.; Sumathy Kutty Amma, B.; Chacko Mathew; Nambiar, P.T.N.; Snehi Dwivedi, R.Changes in the protein content of leaves from healthy and root wilt affected coconut palms have been studied. Alkali—extractable, water—extractable and ethanol—extractable protein fractions were found to be higher in the healthy palms when compared to the diseased palms. A preferential extraction of proteins at low pH values could be obtained in the middle and outer leaves from apparently healthy and diseased palms. An increase of 53.7% and 24.9% over the protein values in the healthy palms was noticed in the middle and outer leaves respectively of the apparently healthy palms while the increase was 42.8% and 14% in the respective leaves of diseased palms. The implications of the protein changes in root (wilt) disease have been discussed.Item Alterations in the leaf protein content of coconut affected by root (wilt) disease(1980-02) Padmaja, G.; Sumathy Kutty Amma, B.; Chacko Mathew; Nambiar, P.T.N.; Snehi Dwivedi, R.Changes in the protein content of leaves from healthy and root wilt affected coconut palms have been studied. Alkali—extractable, water—extractable and ethanol—extractable protein fractions were found to be higher in the healthy palms when compared to the diseased palms. A preferential extraction of proteins at low pH values could be obtained in the middle and outer leaves from apparently healthy and diseased palms. An increase of 53.7% and 24.9% over the protein values in the healthy palms was noticed in the middle and outer leaves respectively of the apparently healthy palms while the increase was 42.8% and 14% in the respective leaves of diseased palms. The implications of the protein changes in root (wilt) disease have been discussed.Item 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.Item Carbonic anhydrase activity in relation to nut yield of coconut palm(2007-02-08) Snehi Dwivedi, R.; Chacko Mathew; Ray, P.K.; Sumathy Kutty Amma, B.; Sunny NinanItem Cellulase activity in the roots of coconut palms affected by root (wilt) disease(2007-02-08) Padmaja, G.; Sumathy Kutty Amma, B.Cellulase activity was determined in the roots of healthy and root (wilt) diseased coconut palms. Higher activity was obtained in the diseased palms when compared to the healthy ones. The results of the study indicate that cellulase might be one of the factors responsible for the vast decay of roots observed in the diseased palms.Item Cellulase activity in the roots of coconut palms affected by root (wilt) disease(1979-12) Padmaja, G.; Sumathy Kutty Amma, B.Cellulase activity was determined in the roots of healthy and root (wilt) diseased coconut palms. Higher activity was obtained in the diseased palms when compared to the healthy ones. The results of the study indicate that cellulase might be one of the factors responsible for the vast decay of roots observed in the diseased palms.Item Certain closely associated morphological symptoms of root (wilt) disease of coconut (Cocos nucifera)(1979-06) Snehi Dwivedi, R.; Chacko Mathew; Ray, P.K.; Sumathy Kutty Amma, B.; Sunny NinanThe morphological symptoms of root (wilt) diseased coconut palms are manifested by softening and whitening of leaflets of the spindle with necrotic spots followed by rotting. Interveinal yellowing in the leaves of the middle whorl was an additional symptom. These symptoms are important in the early diagnosis of the disease in field-grown palms.Item Control of root (wilt) disease of coconut (Cocos nucifera) with micronutrients, phenolic compounds and ascorbic acid(1980-09) Snehi Dwivedi, R.; Sumathy Kutty Amma, B.; Chacko Mathew; Ray, P.K.Certain phenolic compounds, micronulrienls, and ascorbic acid markedly reduced root (wilt) disease symptoms on coconut. The improvement was most pronounced when all three treatments were applied in combination. Yield also increased significantly in all treatments except phenolic compounds.Item Control of root (wilt) disease of coconut (Cocos nucifera) with micronutrients, phenolic compounds and ascorbic acid(2007-02-08) Snehi Dwivedi, R.; Sumathy Kutty Amma, B.; Chacko Mathew; Ray, P.K.Certain phenolic compounds, micronulrienls, and ascorbic acid markedly reduced root (wilt) disease symptoms on coconut. The improvement wai most pronounced when all three treatments were applied in combination. Yield also increased significantly in all treatments except plienolic compounds.Item Early diagnostic techniques on the root (wilt) disease of coconut in India(2007-02-08) Rajagopal, V.; Sasikala, M.; Sumathy Kutty Amma, B.; Chempakam, B.; Rawther, T.S.S.Item 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.Item 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.Item Embryo culture technique to tackle coconut root (wilt)(1965) Sumathy Kutty Amma, B.; Pillai, N.G.; Lal, S.B.Item Embryo culture technique to tackle coconut root (wilt)(2007-02-08) Sumathy Kutty Amma, B.; Pillai, N.G.; Lal, S.B.Item Identification of root(wilt) diseased coconut palms before visual symptom expression(1986-07) Rajagopal, V.; Sumathy Kutty Amma, B.Determination of stomatal resistance (rs) and leaf water Potential(¥) were employed as techniques to distinguish coconut palms (Cocos nucifera L.) devoid of foliar symptoms ('apparently healthy') from those with symptoms of wilt disease viz. flaccidity, yellowing and necrosis ('wilt diseased'). Infected palms are characterized by low stomatal diffusive resistance and reduction in leaf water potential. Among the apparently healthy palms, some exhibited high rs and high ¥, characteristic of truly healthy palms, while others had the trend similar to the 'wilt' diseased palms. The latter group of palms was considered as disease 'suspects' and was closely monitored for the symptom expression. In about 10 to 14 months, all the palms 'suspected' to be diseased had the visual symptoms of the disease.Item Investigations on Vascular Browning in the Roots of Root (Wilt) Diseased Coconut (Cocos Nucifera Linn.)(2007-02) Snehi Dwivedi, R.; Solomon, J.J.; Govindankutty, M.P.; Sumathy Kutty Amma, B.; Potti, V.P.Item Know about Coconut Roots(2007-02) Sumathy Kutty Amma, B.; Chacko MathewItem 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.