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Assiut University (2019)

Effect of Gamma and Laser Rays on Growth and Flowering of Salvia coccinea Plants and Their Physiological Response to Drought Stress

Mostafa ؛ Mohamed Sayed Gad

Titre : Effect of Gamma and Laser Rays on Growth and Flowering of Salvia coccinea Plants and Their Physiological Response to Drought Stress

Auteur : Mostafa ؛ Mohamed Sayed Gad

Etablissement de soutenance : Assiut University

Grade : Doctor of Philosophy (PhD) in Agricultural Sciences 2019

Résumé partiel
The present work was carried out at the Nursery of ornamental plants, Faculty of Agriculture, South Valley University during successive seasons of 2016/2017 (M1 generation) and 2017/2018 (M2 generation) to define the most effective combination of gamma or laser-irradiated seeds of Salvia coccinea and moisture supply in enhancing the tolerance to drought stress that developed in M1 and M2 generations. Seeds were irradiated in October 2016 with gamma-rays at 5, 10, 15, 20 and 25 K.rad or laser-radiation for 5, 10, 15 and 20 min. exposure time, in addition unirradiated control and then immediately planted in pots filled with clay soil. After complete emergence of the irradiated seedlings (40-day-old) transplanted singly into pots of 2.2 l contained 3.5 kg air-dried clay soil to follow up the growth and development of the newly generated plant under different soil moisture levels ; 100 (control), 80, 60 and 40% F.C in M1. Because of the failure of high water stress (40% F.C) in seed set at the end M1, M2 plants were irrigated at three moisture levels (100, 80 and 60% F.C). Pots were placed in polyhouse clear sheets under partial shade conditions (50% shade), ambient temperature 20-35°C and relative humidity 70-75% until the end of M1 and M2 (June 2017 and 2018). Pots were arranged in split-plot design ; the main plots were soil moisture levels and sub-plots were pre-sowing irradiation. Each experimental unit contained four plants (pots) and replicated three times. Data were recorded on germination attributes, the parameters of vegetative growth, root system and flowering, as well as leaf contents of some macro and micro-nutrients and their uptake by plant, some active biochemical constituents, enzymatic activities and physiological traits.

Présentation étendue (EULC)

Page publiée le 7 janvier 2021