Indol-3-ylacetic acid- and calmodulin-regulated Ca2+-ATPase: A target for the phytotoxic action of hexachlorocyclohexane     

Khandavilli Sharada  Bharathi P. Salimath  H. Shekar Shetty  N. Gopalakrishna  K. Karanth 《Pest management science》1992,35(4):315-319

In rice seedlings, the organochlorine insecticide hexachlorocyclohexane (HCH) and its four major isomers—α,β, γ, and δ—have been shown to elicit their phytotoxic action by interacting with indol-3-ylacetic acid (IAA)-regulated growth and Ca²⁺-ATPase activity. When rice seedlings were grown in the presence of 0.34 mM HCH, seedling vigour was reduced to 33% of the control. A similar effect was observed when seedlings were grown in the presence of the γ and δ isomers, but not with the α and δ isomers of HCH. This reduced vigour could be restored by treating the seedlings with 100 nM IAA, suggesting that HCH and its isomers (γ and δ) limit either IAA synthesis or action or both. In a microsomal fraction from rice seedlings grown in the presence of either HCH or its isomers, the calmodulin-regulated Ca²⁺-ATPase activity was inhibited as follows: technical HCH = 46%, α isomer = 80%, β isomer = 72%, γ isomer = 65% and δ isomer = 62% of the control value, respectively. TLC analysis suggested that the various isomers of HCH are metabolised by the plant, except for the δ isotner, which accumulated. This isomer, along with the degraded products of other isomers, may be responsible for the phytotoxic action of HCH.  相似文献   

DIFFERENTIAL TRANSLOCATION OF 59IRON IN IRON SUFFICIENT AND DEFICIENT SORGHUM PLANTS     

Govind Singh  N. S. Nathawat  Nand Kishore  Sharada Ramani  N. K. Ramaswamy  S. F. D’Souza 《Journal of plant nutrition》2013,36(11):1723-1735

Radioactively labeled iron (⁵⁹Fe) was used to study differential uptake in sorghum plants in the recovery stage of chlorosis. Radio-labeled ⁵⁹Fe was supplied through root feeding in nutrient solution experiment (48 hrs, pH 6.2) to non-chlorotic and chlorotic plants. Chlorotic plants were further treated with foliar spray [ferrous sulfate (FeSO₄), FeSO₄ + thiourea (TU), FeSO₄ + citric acid (CA), FeSO₄ + thioglycollic acid (TGA)] to study the uptake of radio-labeled ⁵⁹Fe through root feeding during recovery process of chlorosis. Under iron deficiency, the differential uptake of ⁵⁹Fe was markedly increased in leaves and stem of chlorotic control (-Fe) sorghum plants as compared to non-chlorotic control (+Fe) and foliar sprayed (FeSO₄, FeSO₄ + TU, FeSO₄ + CA, and FeSO₄ + TGA) plants. The lowest uptake of ⁵⁹Fe was observed in younger leaves (24.33 nmol, g^?1 fresh weight h^?1) and stem (1.98 nmol, g^?1 fresh weight h^?1) of non-chlorotic control followed by foliar sprayed plants in comparison to chlorotic control, respectively. Similarly less ⁵⁹Fe uptake was observed in the older leaves of FeSO₄ + CA sprayed (21.70 nmol, g^?1 fresh weight h^?1) plants in comparison to chlorotic control (35.60 nmol, g^?1 fresh weight h^?1). The highest differential ⁵⁹Fe uptake through nutrient medium was in the roots of plants, which were foliar sprayed with FeSO₄ along with TU. The role of iron alone and along with citric acid and thiol compounds is discussed in recovery of chlorosis.  相似文献   

Leaf blast disease in finger millet [Eleusine coracana (L.) Gaertn.] caused by Bipolaris sorokiniana Sacc.: a histopathological study     

Preethi  Pereira  Sharada  M. S.  Divya  C. R. 《植物病害和植物保护杂志》2020,127(6):899-903

Journal of Plant Diseases and Protection - Finger millet (Eleusine coracana L.) is a staple food in many African and South Asian countries and is ranked fourth among millets produced worldwide....  相似文献   

Typing of Staphylococcus aureus isolated from bovine mastitis cases in Australia and India          下载免费PDF全文

J Gogoi‐Tiwari  C Babra Waryah  R Sunagar  HB Veeresh  V Nuthanalakshmi  PL Preethirani  R Sharada  S Isloor  A Bhat  H Al‐Salami  NR Hegde  TK Mukkur 《Australian veterinary journal》2015,93(8):278-282

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