Premium
Inheritance of Latent Period of Puccinia recondita in Wheat
Author(s) -
Shaner Gregory,
Buechley George,
Nyquist Wyman E.
Publication year - 1997
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1997.0011183x003700030010x
Subject(s) - puccinia recondita , biology , heritability , wheat leaf rust , epistasis , latent tuberculosis , period (music) , population , trait , botany , genetics , cultivar , demography , mycobacterium tuberculosis , gene , virulence , tuberculosis , medicine , physics , pathology , sociology , acoustics , computer science , programming language
Long latent period, a major component of slow leaf‐rusting resistance in wheat ( Triticum aestivum L.), was studied in the progeny of a cross between cultivars CI 13227 and Suwon 92. F 2 plants and F 3 ‐and F 6 ‐derived F 7 families, each derived from a different F 2 plant by single‐seed descent, were evaluated for latent period of infection by Puccinia recondita Roberge ex Desmaz. There was a wide range in latent period among F 2 plants and highly significant differences in latent period among families. The distributions of latent period for F 2 plants and F 3 and F 7 family means were skewed to the right, and population means were significantly below midparental values. The data suggested that four loci with epistatic effects controlled latent period. Because approximately three‐fourths of the F 7 families had values below the midparental value, it appeared that a gene at one of the four loci exerted a major effect on latent period. Although latent period is a quantitative trait, narrow‐sense heritability of an F 2 individual was fairly high, ranging from 0.64 to 0.98, and the trait could be measured with acceptable precision by visual estimation of the percentage of infection sites that had erupted into pustules at each day after inoculation. Selection for the trait could begin in the F 2 generation, but desirable phenotypes will continue to segregate in later generations from somewhat susceptible plants, so it may be advisable to carry bulk populations for several generations from which fairly homozygous, slow rusting plants may be selected.