جستجوی مقالات مرتبط با کلیدواژه "کاروتنوئید" در نشریات گروه "بیوتکنولوژی و ژنتیک گیاهی"

Considering the importance of potato in the economy and human nutrition, the need to produce healthy seeds through tissue culture in order to increase the quality of the tuber and ultimately maintain the yield of the product is noticeable. In this regard, the aim of the present study is to evaluate the morphological and biochemical traits in the seedlings of four early and late potato cultivars under in vitro conditions. Four commercial varieties of potato were cultivated as single-node microspecimens in MS culture medium without any plant growth regulators. Seedlings grew after 5 weeks. Seedlings were evaluated in terms of morphological traits (number of seedlings produced from one seedling, stem length, number of branches, nodes, roots and micro-gland) as well as biochemical traits (chlorophyll a, b, carotenoid, anthocyanin, catalase enzyme activity and polyphenol oxidase enzyme activity). In morphological traits, late cultivar Satina, number of seedlings and stem length, and early cultivar Sante showed more roots than other cultivars. In the study of biochemical traits, the late cultivar Agria was superior to other cultivars in terms of the amount of pigments and catalase enzyme. In the same vegetative conditions, different cultivars have different potential in vegetative and biochemical traits. The growth pattern of different genotypes is determined by the synthesis of food and different levels of internal hormones and the balance between them, and as a result, they give different responses to the conditions of the culture environment. The present study showed that in the same vegetative conditions, the early cultivars of Satina in terms of vegetative traits and Agria in terms of the amount of pigments can be selected for mass cultivation.

In order to study the effects of biofertilizers on the growth properties and the physiological parameters of the Coriander (Coriandrum sativum L.) under salinity stress, a completely-randomized, factorial-design experiment was carried out with three replications under the greenhouse conditions at Sari Agricultural Sciences and Natural Resources University. The factors under treatment included the salinity stress (by sodium chloride) at four levels (control, 30, 60 and 90 mM) and the pretreatment of the commercial biofertilizers, such as Nitroxin (including Azospirillium and Azotobacter) and Supernitroplus (including Aspirillium, Bacillus subtilis, Pseudomonas fluorescens). The results indicated that the interaction effect of the biofertilizers and the salinity was significant on chlorophyll a, chlorophyll b, and a+b contents at P< 0.01. According to the results, the bacterial inoculation had a positive and significant effect on the amount of chlorophyll at all salinity levels under study except for the 60 mM level. The maximum amount of chlorophyll b and a+b contents (6.06 and 20.08 μg/ml, respectively) were obtained from the Supernitroplus treatment at 90 mM salinity level, which increased up to 57.4% and 30% in comparison to the plants under the non-inoculated treatment, respectively. In addition, the interaction effect of salinity and inoculation was significant for all of the traits studied except for the plant height and the dry weight. The highest leaf surface area belonged to the plants under Nitroxin treatment at the control salinity level (with 37.71 cm) which demonstrated a 44.9% increase compared to the plants under the non-inoculated treatment at the same level. Generally speaking, all of the above-mentioned morphological traits significantly decreased by an increase in salinity levels.