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sur le développement des zones arides et semi-arides

Titre : Genetic studies on drought resistance in wheat

Auteur : Hanna, Nabil Sournan.

Etablissement de soutenance : Benha University .

Grade : Doctor of Philosophy in Genetics 1990

Résumé partiel
Twenty five genotypes of wheat (T. aestivum) were screened under pots and field experiment at Sids Agriculture Research Station. Beni Sweif Governorate for some agronomic and morphological characters that are considered to be criteria for selecting drought tolerance genotypes. The selected six wheat genotypes from the screening experiments were used to study the genetic system controlling the investigated characters and its relations under different soil moisture levels. The selected genotypes for this study were mainly based on the data of grain yield and drought susceptibility index (5). This index was calculated from the obtained data using the formula presnted by John et al.(1984). These six selected lines (parents) from screening experiment were three tolerent which produce high grain yield per plant under moisture stress levels (01 = 225 mm) and (D2 = 175 mm) as compared with the control treatment (DO = 500 mm). The value of drought susceptibile index (5) was low than one. indicating that parents were drought tolerent. These parents are NS 732- PIMA, Veery ”s” and sakha 69. One moderate tolerent parent was selected. The parent PVN ”s” - MN70121 and two otheres i.e. (STP-YRx WALO (3)- ERA and Kavco. were highly susceptible to water stress.The aims of the second experiment were to study the genetic Ivariance components. phenotypic correlations and genotypic correlations between different characters under water stress conditions.The studied characters included, plant height. grain yield per plant. number of kernels per spike. 1000 kernel weight, number of stomata on adaxial surface of flag leaf, root length. root dry weight. harvest index, total DNA content and total RNA content. Most of the studied characters were affected by moisture stress treatments (D1) and (02) except number of stomata on upper flag leaf surface.

Présentation étendue (EULC)