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Accueil du site → Doctorat → Malaysie → Growth, physiological and biochemical processes of water stressed fig (Ficus carica l.) plant influenced by anti-transpirant- brassinolide and carbon dioxide enrichment.

Universiti Putra (2020)

Growth, physiological and biochemical processes of water stressed fig (Ficus carica l.) plant influenced by anti-transpirant- brassinolide and carbon dioxide enrichment.

Zulkarnaini, Zulias Mardinata

Titre : Growth, physiological and biochemical processes of water stressed fig (Ficus carica l.) plant influenced by anti-transpirant- brassinolide and carbon dioxide enrichment.

Auteur : Zulkarnaini, Zulias Mardinata

Université de soutenance : Universiti Putra

Grade : Doctoral thesis 2020

Résumé partiel
Fig (Ficus carica L.) belongs to the Moraceae family. It was a bush or small tree, moderate in size, deciduous with broad, ovate, 3 to 5-lobed leaves, contain copious milky latex and it was a new plant introduced in Malaysia. Brassinolide (BL) was a plant hormone which had biological effects on plant growth and development. While anti-transpirant containing magnesium (Mg) and calcium (Ca) as a main component was developed to increase photosynthesis and plant growth. Water stress (WS) adversely impacts many aspects of the physiology of plants, especially photosynthetic capacity. If the stress was prolonged, plant growth and productivity were severely diminished. In some other conditions, plants with high carbon dioxide (CO2) concentration grew better than plants grown under ambient air conditions. The response of plant growth to CO2 enrichment depends on the level of concentration, duration of CO2 enrichment, nutrient availability, temperature, irradiance, water, and varieties. Little information on exogenous application of BL, anti-transpirant, elevated CO2, and combination of them with WS on growth, physiological changes, and biochemical responses of fig plants. Thus, the aim of this study was (i) to investigate the effect of different concentration of exogenous application of BL on growth and physiological changes of fig var. Improved Brown Turkey (IBT) and Masui Dauphine (MD), (ii) to determine the effect antitranspirant on growth and physiological changes under optimized BL concentration and best respond fig variety, (iii) to study the possible role of exogenously applied anti-transpirant in alleviating the detrimental effects of drought in fig under optimization of BL grown under a greenhouse and (iv) to study the effect short-term elevated CO2 and water stress on biochemical responses and leaf gas exchange of fig under optimized BL concentration. Fig plant was propagated using cuttings were transferred into mixed soil 3:2:1 (3 topsoil : 2 organic matters:1 sand). In Exp. 1, two different fig varieties (V) (IBT and MD) were sprayed into four levels (0, 50, 100, and 200 ml L-1) of BL concentration. Different varieties of fig were considered as a main plot and BL concentrations (B) as a subplot. The experiment was arranged as a Split Plot Randomized Complete Block Design (SRCBD) with 4 replications (3 plants/rep). In Exp. 2, the plants were treated with four different concentrations (0, 2, 2.5, and 3 kg ha-1) of anti-transpirant rate under optimized BL concentration using the best response of fig variety from exp. 1. The experiment was laid out as a Randomized Complete Block Design (RCBD) factorial with 3 replications (3 plants/rep). In Exp. 3, the plants were subjected to two WS levels : well-watered (WW) and water-stressed (WS). WS was defined at 100% and 25% water holding capacity, respectively.

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