Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Diallel crosses analysis of some faba bean varieties (vicia faba, l.) for improving yield and its components under rainfed conditions

Auteur : Hassan, Wafaa Abdulla.

Etablissement de soutenance : Benha University .

Grade : Master of Science in Agricultural Science 2001

Résumé partiel
The main objective of this investigation was to determine the extent of heterosis and combining ability estimates and their interactions with environments for some agronomic characters and susceptibility index (SI) for yield and its components in some faba bean genotypes and their hybrids. Seven parental genotypes namely, Giza blanka (Pj), Giza-717 (P2) Triple-white (P3), Giza-643 (P4), Giza-461 (Pj), Moshtohor-109 (P6) and Moshtohor-l03 (P7) representing wide range of variability in most of the studied traits were utilized. In 1999/2000 season, two experiments were conducted, each experiment include the seven parents and their 21 Fl hybrids, which were sown on zo” ovember 1999. in a randomized complete block design with three replications. The two experiments were planted in two adjacent fields. The first experiment was normally irrigation and the second one was irrigated at sowing, then plants were left to grow under rainfed (stress environment). Data were recorded on 10 guarded plants, randomly sampled from each plot for F1 generation where the studied traits were plant height, first fruiting node, yield and some of its components. The susceptibility index (SI) was calculated for the two environments (normal and rainfall irrigation) from origin data for yield and yield components before, using a generalized formula (Fischer and Maurer 1978). An ordinary analysis of variance was firstly performed for each experiment and then a combined analysis was carried out whenever homoge eity of error variances was realized. Heterosis was computed as mean squares and as the percentage deviation of FImean performance from either the mid-parent or the better parent average values for each individual cross. General and specific combining ability estimates were obtained by employing Griffing s diaIlel cross analysis (1956) designated as model-1 method -2.

Présentation étendue (EULC)