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Plant Pathology Journal
  Year: 2018 | Volume: 17 | Issue: 1 | Page No.: 39-50
DOI: 10.3923/ppj.2018.39.50
Developing Some Promising Lines Resistant to Pyricularia grisea Derived from Egyptian and American Rice Varieties (Oryza sativia L.)
Hamada M. Hassan, Adel A. Rezk, Amr A. Hassan, Mohammed I. Al-Daej and Mohamed M. El-Malky

Abstract:
Background and Objective: The main disease constraint for rice production in the world is blast, caused by Pyricularia grisea. Traditional breeding is one of most economic methods to produce durable resistance. The aim of the study was to develop some promising resistant lines between American and Egyptian in order to study their genetic parameters and investigate correlation co-efficient of agronomic traits. Materials and Methods: In this study, the crossing was carried out between blast resistant parents (Egyptian) used as a donors and susceptible parents (Americans). Twenty four promising lines were selected in the late generations and evaluated at three locations; i.e., Sakha, Gemmiza and Zarzora during 2015 up to 2017. Results: The results indicated that the Egyptian varieties carry different resistance genes and these genes are dominant under Egyptian condition but the American varieties carry recessive genes for resistance. On the other hand, the genes Pii, Piz, Piz-t, Pit, Pi5(t), Pi9, Pita, Pita(2) and piz(5) were effective and dominant under Egyptian condition. Concerning agronomic traits, the results showed that the earliest plants were observed in line 18 followed by line 19 and Giza 177, while the latest ones were Giza 178, line 12 and line 13. In addition, line 9 and line 19 had the longest panicles. Lines 14, 20, 21 and 28 produced the highest number of tillers and panicles/plant. Phenotypic (б2ph) and genotypic (б2g) variances were observed for number of filled grains/panicle followed by grain yield/plant, sterility percentage, 1000 grain weight and plant height, indicating a better scope for the genetic improvement in these traits. On the other hand, convenient estimates of Genotypic Coefficients of Variability (GCV) coupled with high broad-sense heritability and high genetic advance were found for duration, plant height, number of tillers/plant, number of filled grains/panicle, 1000 grain weight, sterility percentage and grain yield/plant. The phenotypic correlation coefficients among all possible pairs of grain yield components and grain yield were positive and strongly correlated with each of number of tillers/plant (0.354), number of panicles/plant (0.533), number of filled grains/panicle (0.558) and 1000 grain weight (0.470). Conclusion: Egyptian varieties (Giza 177 and Giza 178) carry different dominant resistant and effective genes while the American varieties carry recessive genes for resistance.
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How to cite this article:

Hamada M. Hassan, Adel A. Rezk, Amr A. Hassan, Mohammed I. Al-Daej and Mohamed M. El-Malky, 2018. Developing Some Promising Lines Resistant to Pyricularia grisea Derived from Egyptian and American Rice Varieties (Oryza sativia L.). Plant Pathology Journal, 17: 39-50.

DOI: 10.3923/ppj.2018.39.50

URL: https://scialert.net/abstract/?doi=ppj.2018.39.50

 
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