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Abnormal flowers of Argemone mexicana are described in whichthe gynoecium has been transformed into a cup with lobed marginor into free leafy carpels. The number of lobes or leafy carpelsin such gynoecia is found to vary from three to five. This agreeswith the general view of systematists regarding the number ofcarpels composing the gynoecium in this species, and is againstthe views of Saunders and Dickson who postulate twice as manycarpels. 相似文献
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Transverse Relaxation Time of Leaf Water Protons and Membrane Injury in Wheat (Triticum aestivum L.) in Response to High Temperature 总被引:2,自引:0,他引:2
MAHESWARI M.; JOSHI D. K.; SAHA R.; NAGARAJAN S.; GAMBHIR P. N. 《Annals of botany》1999,84(6):741-745
The relationship between high temperature stress injury andtemperature dependence of the transverse relaxation time (T2)of leaf water was examined using NMR in four cultivars of wheatdiffering in their sensitivity to high temperature stress. TheT2declined with increasing temperature between 25 and 35 °C.A comparison of relative injury based on electrolyte leakageand T2, between 40 and 50 °C, indicated that while membranepermeability increased with increasing temperature there wasan increase in T2until 44 and 48 °C in susceptible and tolerantcultivars respectively, followed by a sharp decline. This patternof change in T2with increasing temperature was consistent whetherthe same or different samples were used for each treatment temperature.Loss of temperature dependence of T2after heat killing indicatedirreversible changes in T2, probably due to the loss of membraneintegrity. Heat tolerant varieties, which suffered less membraneinjury, had a higher T2compared to susceptible varieties. Tolerantvarieties also maintained the T2of leaf water protons to highertemperatures than did sensitive varieties. This NMR-based, non-invasive,rapid technique could be used to efficiently detect heat injuryin leaf tissues. Copyright 1999 Annals of Botany Company Membrane integrity, transverse relaxation time, high temperature stress, Triticum aestivum L. 相似文献
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Production protocol for and storage efficacy of an anthocorid predator Cardiastethus exiguus Poppius
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Cardiastethus exiguus Poppius is an indigenous anthocorid predator of eggs and neonates of the notorious pest,coconut black-headed caterpillar Opisina arenosella Walker in India.At the National Bureau of Agriculturally Important Insects(Indian Council of Agricultural Research),Bangalore,India,a simple mass production protocol was developed for multiplying C.exiguus using UV-irradiated eggs of alternate laboratory host Corcyra cephalonica Stainton.Field evaluation of the predator in the states of Kerala and Karnataka indicated that this predator could bring about a significant reduction in the pest population.Subsequently,the need was felt to investigate the storage efficacy of the eggs and adults of C.exiguus so that sufficient numbers could be accumulated and transportation of the predator could be planned for field releases.Low temperature storage studies indicated that C.exiguus eggs can be safely stored for up to 5 days at 10℃ and 10 days at 15℃ and incubation period could be staggered for up to 10 and 13 days,respectively.The longevity of the C.exiguus adults was significantly reduced due to low temperature storage.However,for adult females,a storage temperature of 15℃ for 15 days could be recommended as they could live for a more than a month after removal from storage and their progeny production was comparable to that of the control adults. 相似文献
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A. PAVAN-KUMAR SUDHANSHU RAMAN PRAKASH G. KORINGA NAMRATA PATEL TEJAS SHAH RAJEEV K. SINGH GOPAL KRISHNA C. G. JOSHI P. GIREESH-BABU APARNA CHAUDHARI 《Journal of genetics》2016,95(4):853-863
The mahseers (Tor, Neolissochilus and Naziritor) are an important group of fishes endemic to Asia with the conservation status of most species evaluated as threatened. Conservation plans to revive these declining wild populations are hindered by unstable taxonomy. Molecular phylogeny studies with mitochondrial genome have been successfully used to reconstruct the phylogenetic tree and to resolve taxonomic ambiguity. In the present study, complete mitochondrial genome of Tor tor has been sequenced using ion torrent next-generation sequencing platform with coverage of more than 1000 ×. Comparative mitogenome analysis shows higher divergence value at ND1 gene than COI gene. Further, occurrence of a distinct genetic lineage of T. tor is revealed. The phylogenetic relationship among mahseer group has been defined as Neolissochilus hexagonolepis ((T. sinensis (T. putitora, T. tor), (T. khudree, T. tambroides)). 相似文献
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The amount of extractable protein from leaves taken at the time of harvest of the edible part was determined for brassicas, beet root, turnip and radish. These leaves yielded much more dry matter and total nitrogen per ha than did the edible material. With only one pulping, from 35 to 59% of protein nitrogen could be extracted and the yields of extractable protein from the leaves ranged from 76 to 170 kg/ha. It would be advantageous to obtain protein from these leaves which otherwise are discarded. 相似文献
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