Ergot reaction of pearl millet hybrids affected by fertility restoration and genetic resistance of parental lines

Rai, K N and Thakur, R P (1995) Ergot reaction of pearl millet hybrids affected by fertility restoration and genetic resistance of parental lines. Euphytica, 83 (3). pp. 225-231. ISSN 1573-5060

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Abstract

High ergot (Claviceps fusiformis Loveless) susceptibility of pearl millet (Pennisetum glaucum (L.) R. Br.) hybrids has often been associated with the A1 cytoplasm of male-sterile lines (A-lines). To understand the underlying basis of this association and to examine the prospects of breeding ergot-resistant hybrids, we evaluated 56 hybrids and their 15 parental lines for ergot reaction and selfed seedset for 2 years in disease nurseries at ICRISAT Asia Center. Hybrids were made by crossing seven pollen parents (2 susceptible and 5 resistant) onto two resistant and two susceptible A-lines, and their four corresponding maintainer lines (B-lines). A-lines had no selfed seedset while B-lines had 32–75% selfed seedset. Hybrids of A-lines had significantly less selfed seedset than the hybrids of the corresponding B-lines. The reduced seedset of A-lines and their hybrids, however, was not always accompanied by significantly higher ergot susceptibility. Highly resistant hybrids were obtained where both A-lines and pollen parents were highly resistant, regardless of male fertility levels of the hybrids. Thus, although the A1 cytoplasm, by its reduction of male fertility, had a large and significant effect in increasing ergot severity of hybrids, the contribution of nuclear genetic factors of female parents was about 1.8 times larger than that of the cytoplasm.

Item Type: Article
Divisions: UNSPECIFIED
CRP: UNSPECIFIED
Uncontrolled Keywords: Pennisetum glaucum, Claviceps fusiformis, cytoplasmic-nuclear male sterility, genetic resistance, pearl millet, ergot
Subjects: Mandate crops > Millets
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 15 Oct 2011 09:33
Last Modified: 15 Oct 2011 09:33
URI: http://oar.icrisat.org/id/eprint/2626
Official URL: http://dx.doi.org/10.1007/BF01678134
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: We sincerely thank Dr. C.T. Hash for his sever- al valuable comments on an early version of this manuscript.
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