Diallel among soybean rust tolerant parents / Dialelo entre genitores de soja tolerantes à ferrugem asiática

AUTOR(ES)

Paulo Fernando de Melo Jorge Vieira

DATA DE PUBLICAÇÃO

2010

RESUMO

This work started a cycle of selection throughout crosses among soybean lines with tolerance against soybean rust. The objectives were to increment the plant tolerance, to estimate useful genetic parameters for soybean breeding programs and to predict the most promising crosses to extract high yielding lines. A complete diallel, without reciprocal, among 10 rust tolerant lines was performed. Those lines were developed by the Sector of Genetics Applied to Autogamous Species from ESALQ-USP. The F2 generation was evaluated in hill plots and genetic parameters related to important agronomic traits were estimated, without evaluating the rust reaction. In the next generation, F2:3 progenies were evaluated in three environments, Anhembi, Areão and ESALQ. Rust reaction was evaluated throughout two main ways: according to the visual scores of rust reaction and contrasts in seed yield (PG) with fungicide experiments. The results showed that the parents have rust resistance alleles that can guarantee the success of the recurrent selection. The methodology of the fungicide contrasts efficiently discriminated the tolerant from the susceptible genotypes. The number of days to maturity influenced the rust reaction scores; so, the maturity groups of the genotypes were estimated for better evaluation of the performance of the progenies. According to the general combining ability (GCA) for yield and rust reaction, the parent USP 191-104- 11 (10) has the highest potential to generate high yielding lines. The crosses USP 02- 16.045 (2) x USP 16.015 (4), USP 16.015 (4) x USP 97-10.046 (6), USP 11-38 (5) x USP 97-10.046 (6) and USP 02-16.045 (2) x USP 191-104-11 (10) exceeded due the higher number of progenies with high yield and with tolerance or moderate tolerance to asian soybean rust.

ASSUNTO(S)

tolerância. combining ability glycine max phakopsora pachyrhizi breeding ferrugem - doença de planta soja melhoramento genético vegetal tolerance. maturação vegetal maturity groups

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