Influence of flowering event factors in cytoplasmic male sterile lines and F1 hybrids on infection by Claviceps fusiformis in pearl millet

    Thakur, R P and Rao, V P and King, S B (1991) Influence of flowering event factors in cytoplasmic male sterile lines and F1 hybrids on infection by Claviceps fusiformis in pearl millet. Plant Disease, 75 (12). pp. 1217-1222. ISSN 0191-2917

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    Abstract

    The influence of flowering event factors, such as length of protogyny period, and time between full protogyny (FP) and anthesis initiation (AI) on infection by Claviceps fusiformis was studied in seven cytoplasmic male sterile (CMS) lines (A lines), their corresponding maintainer lines (B lines), nine pollinator lines (R lines), and their 64 F1 hybrids (A × R and B × R) of pearl millet (Pennisetum glaucum). Three of the seven A lines had significantly longer protogyny than their corresponding B lines. The protogyny periods in R lines (range 38–84 hr) were shorter than in B lines (range 45–135 hr). Significant positive correlations were found between protogyny, the FP-AI period, and ergot severity in susceptible A or B lines and their F1 hybrids, regardless of the susceptibility or resistance of R lines, but not in resistant A, B, and R lines and their hybrids. Seed set was generally more in B × R hybrids than in A × R hybrids, indicating poor restoration ability of R lines. Stigmas were longer in susceptible lines and their hybrids than in resistant lines and hybrids. The susceptibility of F1 hybrids was closely associated with flowering event factors of susceptible A lines. No such relationship was found in resistant lines. This indicates that there may be a factor or factors independent of flowering events governing resistance in A lines and their hybrids.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Mandate crops > Millets
    Depositing User: Mr Charan Sai Ch
    Date Deposited: 25 Oct 2011 13:06
    Last Modified: 25 Oct 2011 13:06
    URI: http://oar.icrisat.org/id/eprint/2897
    Official URL: http://dx.doi.org/10.1094/PD-75-1217.
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: UNSPECIFIED
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