Browsing by Author "Ray, P.K."
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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 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 Carbonic anhydrase, biologically active zinc and carbon fixation in coconut palm(2007-02-08) Dwivedi, R.S.; Chacko Mathew; Michael, K.J.; Amma, B.S.K.; Ray, P.K.; Sunny NinanActivity of carbonic anhydrase in the first fully opened leaf (FFL) of erect canopied palms (EC) was higher than that of spherical canopied palms (SC) but the reverse was true in case of middle leaves (ML). The carbon fixation rate of FFL and ML of SC palms did not differ significantly but in EC palms CO2 assimilation of former leaf was higher than latter one. However the C02 assimilation rate in FFL of EC palms did not differ markedly with FFL and ML of SC palms. But C02 fixation in ML of SC palms was significantly higher than that of EC palms. This is correlated with EDTA-zinc (biologically active zinc) but not with total zinc, since in all types of palms the total zinc ranged from 24-28ppm. Also the nut yield in SC palms was found to exceed by 1.2-2.5 times over that in EC palms. Irrespective of canopy structure, the root (wilt) dieseased palms also showed the same trend as that of EC palms. The correlation coefficient values of biologically active zinc, total zinc and carbonic anhydrase was found to be 0.94, 0.66 and 0.78, respectively, with CO2 assimilation rate; and 0.90, 0.56 and 0.76, respectively, with nut yield. This reveals that it is not the total zinc but it is carbonic anhydrase activity and the biologically active zinc which play an important role in regulating CO2 fixation and nut yield of coconut.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 Efficiency of different methods of fertiliser application in coconut using radio-isotope technique(2007-02-08) Ray, P.K.; Dwivedi, R.S.; Sunny NinanDifferent methods of plant injection and soil placement techniques were tried. KH232PO4 was used in this study which was simultaneously confirmed by tagged single Superphosphate fertiliser application. In plant injection technique, 32P was fed to the palms through growing root tip, cut end of root, stem injection and leaf axil application; whereas in soil placement method, the radio-active P was applied to the palms through basin, circular trenches, strips and holes made around the bole. Plant injection technique was efficient and economical than soil application method. Among plant injection methods, the application of 32P through cut-end of roots was most efficient and the radioactivity in the palm was detected after 4 hours of application. On the other hand, the radioactivity in the palm was detected after 8, 12 and 18 hours of application through stem, leaf axil and growing root tip, respectively. Out of four methods of soil application tried, the placement of radioactive P through holes gave quick recovery. The 32P activity was detected in the palm after 7, 8, 8 and 11 days, respectively, in hole, circular trench, strip and basin application methods. The 32P absorption was equally efficient in the palms, receiving irrigation daily and once in a week.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 Rapid Biochemical Test to Detect Root (Wilt) Disease of Coconut(1977) Dwivedi, R.S.; Chacko Mathew; Ray, P.K.; Sumathy Kutty Amma, B.; Sunny NinanItem Rapid Biochemical Test to Detect Root (Wilt) Disease of Coconut(1977) Dwivedi, R.S.; Chacko Mathew; Ray, P.K.; Sumathy Kutty Amma, B.; Sunny Ninan