Browsing by Author "Snehi Dwivedi, R."
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Item Absorption, Distribution and Utilization of Radioactive Phosphorus in Healthy and Root (Wilt) Diseased Coconut Palms(1979) Snehi Dwivedi, R.; Ray, P.K.; Sunny NinanRadioactive KH,PO4 was fed to coconut leaves and palms under laboratory and field conditions. In healthy palms the absorption of phosphorus by roots and Us accumulation In spindle and first fully opened leaves was found to be significantly higher till 9th hr as compared to that of diseased palms, but at later stages the reverse pattern was observed. The time required for 12P to reach the spindle (top-most leaf) situated at 9.5 m height In both diseased and healthy palm was found to be 3 hr only. In contrast to the leaves, the activity of P differed insignificantly in stem and roots of healthy and diseased palms and also the native P remained higher In the stem and roots of former palms as compared to latter. The analysis of total and different fractions of phosphorus and entry of P in the different forms of organic phosphorus indicated that although total P was more in the case of diseased palms but the organic phosphorus especially the nucleic acid P was significantly less as compared to healthy ones. This revealed less utilization of absorbed P in the synthesis of P-constituted organic substances in diseased palms.Item Absorption, Distribution and Utilization of Radioactive Phosphorus in Healthy and Root (Wilt) Diseased Coconut Palms(2007-02-08) Snehi Dwivedi, R.; Ray, P.K.; Sunny NinanRadioactive KH,PO4 was fed to coconut leaves and palms under laboratory and field conditions. In healthy palms the absorption of phosphorus by roots and Us accumulation In spindle and first fully opened leaves was found to be significantly higher till 9lh hr as compared to that of diseased palms, but at later stages the reverse pattern was observed. The time required for 12P to reach the spindle (top-most leaf) situated at 9.5 m height In both diseased and healthy palm was found to be 3 hr only. In contrast to the leaves, the activity of P differed insignificantly in stem and roots of healthy and diseased palms and also the native P remained higher In the stem and roots of former palms as compared to latter. The analysis of total and different fractions of phosphorus and entry of P in the different forms of organic phosphorus indicated that although total P was more in the case of diseased palms but the organic phosphorus especially the nucleic acid P was significantly less as compared to healthy ones. This revealed less utilization of absorbed P in the synthesis of P-constituted organic substances in diseased palms.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 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 Carbonic anhydrase activity versus acidity in low yielding & high yielding coconut palms (Cocos nucifera Linn.)(1980-10) Padmaja, G.; Sumathikutty Amma, B.; Chacko Mathew; Ray, P.K.; Snehi Dwivedi, R.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 Certain closely associated morphological symptoms of root (wilt) disease of coconut (Cocos nucifera)(2007-02-08) Snehi Dwivedi, R.; Chacko Mathew; Ray, P.K.; Amma, B.S.K.; 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 Distribution, absorption and translocation pattern of radioactive P and Eb in healthy and root(wilt) affected coconut palms(Central Plantation Crops Research Institute Regional Station, Kayangulam, Kerala, 1981) Snehi Dwivedi, R.Item Foliar absorption and distribution of radioactive phosphorus in healthy and root (wilt) diseased coconut palms(2007-02) Snehi Dwivedi, R.; Ray, P.K.; Sunny NinanRadioactive S2P was fed to the coconut leaves in the laboratory and palms in the field. Higher rates of 32P absorption and accumulation were recorded in healthy palms than in diseased ones at early hours of experiment, but during later period the trend of "P accumulation was reversed. The "P activity in the stems of healthy palms was lower than that of diseased ones but a reverse pattern was noted in native phosphorus content. Similarly, the outer, middle, and first fully opened leaves of healthy palms did not differ much in phosphorus content, but in the case of diseased ones, wide variations were observed. The autoradiographs and **P countrigs indicated that P was more in the leaves and less in the roots of diseased palms as compared to those of healthy ones.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 Physiological and Biochemical Aspects(2007-02) Chacko Mathew; Snehi Dwivedi, R.