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对珍珠粟霜霉病完全抗性的遗传

Inheritance of Complete Resistance to Pearl Millet Downy Mildew.

作者信息

Singh S D, Talukdar B S

机构信息

International Crops Research Institute for the Semi-Arid Tropics, Patancheru, AP 502 324, India.

出版信息

Plant Dis. 1998 Jul;82(7):791-793. doi: 10.1094/PDIS.1998.82.7.791.

Abstract

Inheritance of downy mildew (Sclerospora graminicola) resistance in pearl millet (Pennisetum glaucum) was studied in a cross involving DMRP (downy mildew resistant Pennisetum) 292 and DMSP (downy mildew susceptible Pennisetum) 23. DMRP 292, derived from IP 18292, and DMSP 23, derived from Tift 23DB, were made homozygous for downy mildew resistance-susceptibility by three generations of single plant selection followinginoculations with homogenized sporangial population of S. graminicola from the ICRISAT Asia Center. Potted seedlings of parental lines, F, F, and BC progenies were evaluated for their reactions to downy mildew following inoculation. The results show that complete resistance to downy mildew in DMRP 292 is controlled by a single dominant gene. Because of the simple mode of inheritance, resistance utilization from DMRP 292 is simple and straightforward. We designate this gene as Rsg.

摘要

在一个涉及抗霜霉病珍珠粟(DMRP,即抗霜霉病黍属)292和感霜霉病珍珠粟(DMSP,即感霜霉病黍属)23的杂交组合中,对珍珠粟(黍稷)霜霉病(禾生指梗霉)抗性的遗传进行了研究。源自IP 18292的DMRP 292和源自Tift 23DB的DMSP 23,在接种来自国际半干旱热带作物研究所亚洲中心的禾生指梗霉均质孢子囊群体后,通过三代单株选择使其霜霉病抗性 - 敏感性纯合。对接种后的亲本系、F、F和BC后代的盆栽幼苗进行霜霉病反应评估。结果表明,DMRP 292对霜霉病的完全抗性由单个显性基因控制。由于遗传方式简单,利用DMRP 292的抗性简单直接。我们将该基因命名为Rsg。

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