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Mansoura University (2021)

Evaluation of some flax genotypes and its crosses under normal irrigation and drought stress conditions

El-metwally, Lamiaa Ibrahim MohAmmed

Titre : Evaluation of some flax genotypes and its crosses under normal irrigation and drought stress conditions

Auteur : El-metwally, Lamiaa Ibrahim MohAmmed

Etablissement de soutenance : Mansoura University

Grade : Master of Science (MS) in Agricultural Science 2021

Résumé partiel
The flax crop is the second most important fiber crop in Egypt. The cultivated area during the 2019/2020 agricultural season is about 21,386 acres, producing about 7525 tons of fiber and 10,000 tons of seed crop (FAO, 2021). In view of the climatic changes that have occurred in recent years and the shortage of water, this study was conducted with the aim of valuating some genetic structures of flax plants to determine the extent of their response to water shortages. This study was conducted at the research farm of the Crops Department - Faculty of Agriculture - Mansoura University - Egypt during the 2018/2019 and 2019/2020 seasons using six flax genotypes as parents that were planted in the first agricultural season and all possible crosses between them were made through the semicircular mating system to obtain Fifteen hybrids. All the resulting hybrids were evaluated, in addition to the parents, to determine their response to water shortage and determine the best. In the implementation of these experiments, a randomized complete block design was used in three replicates. The readings and measurements taken on individual plants included the following characteristics : 1- Early characteristics : number of days to flowering (day) - number of days to maturity (day). 2- Growth characteristics : plant height at the beginning of flowering (cm) - plant height at harvest (cm) - crown area diameter (mm) - stem diameter (mm) - capsule diameter (mm) - effective length (cm). 3- Crop characteristics and components : number of basal branches - number of apical branches - number of capsules in apical branches - number of seeds per capsule - number of plant capsules - length of the fruiting zone (cm) - 1000 - seed (g) - seed yield per plant (gm) - yield straw (g) - biological yield (g) - fiber yield (g). 4- Quality and chemical characteristics : length of fiber (cm) - percentage of fibers % - oil % - iodine number - percentage of cellulose % - hemicellulose % - percentage of lignin % - percentage of cellulose ⁄ lignin %. The normal statistical analysis of the studied traits was carried out using the randomized complete block design in three decisions, then the genetic statistical analysis was conducted to calculate the general and specific ability to combine using the fourth method (one-way crosses without parents) the first model of the world Griffin 1956.The results of this study can be summarized as follows : Variance analysis : The mean squares of deviations of the genotypes for all the traits under study were highly significant for irrigation and drought factor except for the number of days to flowering, plant length at the beginning of flowering, length of the fruiting area, number of capsules per plant, number of seeds per capsule, 1000 - seed weight, and percentage of fiber. As for the genotypes, the mean squares of deviations were highly significant for all the traits under study, except for the trait of the number of basal off shoots. As for the interaction between the two factors of the study, the mean of the squares of deviations was highly significant for all the traits under study except for the trait of the number of basal branches and the number of seeds per capsule. Average behavior of the studied hybrids under irrigation and water stress conditions : The results under study showed that there were significant differences between irrigation and drought treatments on the trait of number of days to maturity, and there were no significant differences between treatments on the trait of number of days until flowering.

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Page publiée le 8 mars 2022