Inheritance of trichomes and resistance to pod borer (Helicoverpa armigera) and their association in interspecific crosses between cultivated pigeonpea (Cajanus cajan) and its wild relative C. scarabaeoides

    Aruna, R and Rao, D M and Reddy, L J and Upadhyaya, H D and Sharma, H C (2005) Inheritance of trichomes and resistance to pod borer (Helicoverpa armigera) and their association in interspecific crosses between cultivated pigeonpea (Cajanus cajan) and its wild relative C. scarabaeoides. Euphytica, 145 (3). pp. 247-257. ISSN 1573-5060

    [img] PDF - Published Version
    Restricted to ICRISAT users only
    Download (314kB) | Request a copy

    Abstract

    The legume pod borer, Helicoverpa armigera, is one of the most devastating pests of pigeonpea. High levels of resistance to pod borer have been reported in the wild relative of pigeonpea, Cajanus scarabaeoides. Trichomes (their type, orientation, density and length) and their exudates on pod wall surface play an important role in the ovipositional behavior and host selection process of insect herbivores. They have been widely exploited as an insect defense mechanism in number of crops. In the present investigation, inheritance of resistance to pod borer and different types of trichomes (A, B, C and D) on the pod wall surface in the parents (C. cajan and C. scarabaeoides) and their F1, F2, BC1 (C. cajan × F1), and F3 generations has been studied. Trichomes of the wild parents (high density of the non-glandular trichomes C and D, and glandular trichome B and low density of glandular trichome A) were dominant over the trichome features of C. cajan. A single dominant gene as indicated by the segregation patterns individually will govern each trait in the F2 and backcross generation. Segregation ratio of 3 (resistant): 1 (susceptible) for resistance to pod borer in the F2 generation under field conditions was corroborated with a ratio of 1:1 in the backcross generation, and the ratio of 1 non-segregating (resistant): 2 segregating (3 resistant: 1 susceptible): 1 non-segregating (susceptible) in F3 generation. Similar results were obtained for pod borer resistance under no-choice conditions. Resistance to pod borer and trichomes associated with it (low density of type A trichome and high density of type C) are governed individually by a dominant allele of a single gene in C. scarabaeoides. Following backcrossing, these traits can be transferred from C. scarabaeoides into the cultivated background.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Uncontrolled Keywords: Cajanus cajan, C. scarabaeoides, Helicoverpa armigera, inheritance, trichomes
    Subjects: Mandate crops > Pigeonpea
    Depositing User: Mr Sanat Kumar Behera
    Date Deposited: 26 Sep 2011 05:31
    Last Modified: 28 Sep 2011 08:29
    URI: http://oar.icrisat.org/id/eprint/1925
    Official URL: http://dx.doi.org/10.1007/s10681-005-1643-y
    Projects: UNSPECIFIED
    Funders: AP-NL Biotechnology Programme
    Acknowledgement: The authors gratefully acknowledge Dr. S.N.Nigam for his critical comments on this manuscript. The first author is thankful to the AP-NL Biotechnology Programme for extending the financial support.Sincere thanks to Sujana for help during the pod borer screening process, to Narayana Chandra for his help in the insect rearing laboratory and to Jacob Mathew for his help.
    Links:
    View Statistics

    Actions (login required)

    View Item View Item
    OAR@ICRISAT is powered by EPrints 3 which is developed by the School of Electronics and Computer Science at the University of Southampton. More information and software credits.