Browsing by Author "Subbarao, G."

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    Breeding cardamom for 'Katte' disease resistance
    (2007-02-08) Subbarao, G.; Naidu, R.
    ' Katte ' or Mosaic disease of small cardamom (E. cardamomum Maton) is an important virus disease transmitted by an aphid (Pentalonia nigronerusa f. caladii Vander Goot). In order to obtain resistant lines, various breeding programmes were initiated at this Research Centre. Evaluation of existing germplasm including high yielders, morphological variants occurring in nature like pinkstemmed, terminal panicle, male sterile and chlorophyll variegants through insect vector has not revealed any resistant types. Seedlings raised after exposing the seeds to physical mutagens at 5, 10, 15 KR of gamma rays and seeds treated with chemical mutagens like Ethyl methane sulpbonate (EMS) and Diethyl sulphate (DES) with different concentrations and treatments has also not yielded positive results in getting a resistant type. Even species of allied genera like Aframomum, Amomum Alpinia have also taken infection. So far the screened material was found to be susceptible.
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    Effect of mutagens on germination in cardamom
    (2007-02-08) Mohamed Sayed, A.A.; Subbarao, G.
    Response of cardamom (Elettaria cardamomum Maton) to ionising radiations and chemical mutagens with special reference to the effect of germination are presented in this paper. Tn the seed treatment no germination was noticed above 30 KR whereas in capsule treatment a few sprouts were noticed at 40 KR, but germination was not noticed above 40 KR. The percentage of germination was observed to be inversely proportional to the dose of gamma rays indicating the lethality of high doses in the life process of the seedlings. The percentage oflger-mination is highly influenced by moisture content of the seed. The LD-50 appears to be around 10 KR.
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    Leaf Area Determination in Cardamom (Elettaria Cardamomum Maton)
    (2007-02) Korikanthimath, V.S.; Subbarao, G.
    A rapid and reliable method for leaf area estimation of intact leaves based on linear measurement using appropriate regression analysis in cardamom (Elettaria cardamomum Maton) is described. The leaf area factor differed with different cultivars.