Improvement and breeding
Shamila Yadollahizadeh; Farzin Abdollahi; Alireza Yavari; Leila Jafari
Abstract
Light is one of the environmental factors influencing the growth and development of plants. In recent years, the attention of agricultural experts has been directed to plant growth regulators in order to improve the quality and stability of the cultivation system. The current research was carried out ...
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Light is one of the environmental factors influencing the growth and development of plants. In recent years, the attention of agricultural experts has been directed to plant growth regulators in order to improve the quality and stability of the cultivation system. The current research was carried out in the year 2021 in the greenhouse of Shahid Fozveh Biological Research Center in a factorial format in the form of a completely randomized design in 5 replications. For this purpose, the effect of test factors including four concentrations of abscisic acid (0, 5, 10 and 20 mg/liter) and 5 day lengths (16, 14, 12, 10 and 8 hours of light) on the growth characteristics and content of photosynthetic pigments. The cannabis plant was evaluated. The results showed that the highest plant height, stem diameter, number of leaves, root length, fresh and dry weight of roots, fresh and dry weight of aerial parts and fresh and dry weight of leaves were obtained under the lighting duration of 14 hours, while the lowest amount of this the traits were observed during the lighting period of 16 hours. Also, the highest amounts of chlorophyll a, b, total and carotenoid were obtained in the treatment of 16 hours of light duration without the use of abscisic acid hormone. While the highest amount of anthocyanin was observed in the treatment of 16 hours of light duration under the treatment of abscisic acid hormone with concentrations of 10 and 20 ppm. Also, the highest amount of total phenol was obtained during the lighting period of 16 hours under the treatment of abscisic acid with a concentration of 20 ppm. Considering the importance and many uses of secondary metabolites in today's human life, investigating the existence of a relationship between environmental conditions and the production and accumulation of secondary metabolites in plants can be very useful. Therefore, it is recommended to use LED light with lighting durations of 14 and 16 hours to increase the growth characteristics and content of photosynthetic pigments of hemp plant.
F. Ghobadi; M. Ghorbani Javid; A. Sorooshzadeh
Abstract
This research was aimed to evaluate the flower and stigma yield as well as growth traits of saffron (Crocus sativus L.) under effect of planting dates and corm size. The experiment was factorial in a complete randomized design with three replicates, conducted at the research farm of College of Aburaihan, ...
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This research was aimed to evaluate the flower and stigma yield as well as growth traits of saffron (Crocus sativus L.) under effect of planting dates and corm size. The experiment was factorial in a complete randomized design with three replicates, conducted at the research farm of College of Aburaihan, University of Tehran during 2013-2014. The treatments consisted of four planting dates (June 10th, September 7th and 27th, and October 12th) and two corm weights (5-9 g and 10-14 g). Our results showed that the flower and stigma yield of large corms, planted on June 10th, was 50% higher as compared with other planting dates, and on September 27th, the yield was 25% higher. However, this difference was not significant in comparison with September 7th. The lowest flower and stigma yield was recorded for the planting date of October 12th in comparison with other planting dates, and these traits were higher in large corms as compared with small ones in all planting dates. The flower length and number of buds on June 10th were higher than that of others. In addition, the highest leaf dry weight and length in primary and secondary buds were recorded for the planting dates of June 10th and September 6th, which could be effective in production of daughter corms in the next year. The results showed that all growth characteristics in large corms were higher than that of small ones. Overall, these results indicate that the planting of 10-14-gram large corms on June 10th can improve the yield and growth characteristics of saffron in Varamin plain.
