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Accueil du site → Doctorat → Pakistan → CHARACTERIZATION AND EVALUATION OF CAMELINA (Camelina sativa crantz L.) AS A POTENTIAL OILSEED CROP UNDER WATER LIMITED ENVIRONMENT

University of Agriculture, Faisalabad (2016)

CHARACTERIZATION AND EVALUATION OF CAMELINA (Camelina sativa crantz L.) AS A POTENTIAL OILSEED CROP UNDER WATER LIMITED ENVIRONMENT

Ahmed, Zeeshan

Titre : CHARACTERIZATION AND EVALUATION OF CAMELINA (Camelina sativa crantz L.) AS A POTENTIAL OILSEED CROP UNDER WATER LIMITED ENVIRONMENT

Auteur : Ahmed, Zeeshan

Université de soutenance : University of Agriculture, Faisalabad

Grade : Doctor of Philosophy (PhD) 2016

Résumé
Water-deficit conditions at early growth stages negatively affect germination and seedling growth, often leading to suboptimal plant population and poor stand establishment. Germination and seedling growth of eight camelina (Camelina sativa crantz L.) genotypes in response to induced water stress conditions were investigated. In two laboratory experiments, the observed germination parameters and calculated stress indices were used as screening criteria for drought tolerance. Germination parameters viz. germination percentage, germination index, promptness index, and germination stress tolerance index declined in response to the increasing polyethylene glycol induced stress levels. Water stress conditions imposed by withholding irrigation at seedling stage reduced plant height stress tolerance index and dry matter stress tolerance index but increased root length stress tolerance. Based on the results of germination attributes and stress indices, camelina genotype 7126 was the most drought tolerant genotype and genotype 8046 was the most drought sensitive genotype among all tested camelina genotypes. Then a series of experiments were conducted to optimize N, P, K doses and sowing date for camelina under normal and drought stress conditions. Camelina showed maximum plant growth when N, P, K were applied at the rates of 50 kg ha-1, 30 kg ha-1 and 60 kg ha-1 respectively with sowing date of 10th November under normal and drought stress conditions. Camelina genotype 7126 revealed better water relations, gas exchange parameters, accumulation of compatible solutes, antioxidant activity, oil and oil quality parameters as compared to genotype 8046 when exposed to various levels of drought stress (100% FC, 80% FC, 60% FC and 40% FC). In the field experiments agronomic performance of both camelina genotypes was tested under different irrigation treatments. Camelina genotype 7126 gave maximum plant height, number of branches per plant, number of pods per plant, 1000-seed weight, biological yield, seed yield and harvest index when irrigated with three irrigations (30 days after sowing date, one irrigation at vegetative stage, one at reproductive stage) followed by two irrigations (one irrigation at vegetative, one at reproductive stage), while minimum value for these parameters was observed where only one irrigation was applied at reproductive stage in genotype 8046. Overall camelina showed good agronomic performance and adaptability under Pakistani soils.

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