Hadi Lotfi; Taher Barzegar; Vali rabiei; Zahra Ghahramani; Jafar Nikbakht
Abstract
In order to evaluate the effect of water stress on fruit quality and quantity of some Iranian melons, the experiment was set out in a split plot design with three replicates in research filed of University of Zanjan in 2014. Treatments consisted arrangement of three Irrigation levels (starting irrigation ...
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In order to evaluate the effect of water stress on fruit quality and quantity of some Iranian melons, the experiment was set out in a split plot design with three replicates in research filed of University of Zanjan in 2014. Treatments consisted arrangement of three Irrigation levels (starting irrigation at 100, 66 and 33 ETc) and 11 genotypes of Iranian melons (ʼKhatouniʻ, ʼKaliʻ, ʼOrshangʻ, ʼMouriʻ, ʼMoziʻ, ʼZarde-Paeizeʻ, ʼShiraziʻ, ʼShiardarʻ, ʼEzmirʻ, ʼEyvan-e-keyʻ and ʼSuski-e-Sabzʻ). Results showed that irrigation had a significant effect on flesh firmness, fruit length and width, thickness of skin, pH, total soluble solids (TSS) content, fruit weight and yield ratio. The water stress significantly increased TSS and reduced flesh firmness. The lowest values of yield (13761 kg/ha), fruit weight (1363.7 gr), fruit width (12.97 cm), and the highest skin thickness (4.63 mm) and pH (6.28) was obtained in the sever water stress (start point of 33 ETc). Melon accessions showed significant differences in studied traits. The highest values of fruit length (31.6 cm), flesh firmness (2.9 kg/cm-2), yield (49698 kg/ha) and fruit weight (3223 gr) was obtained under 100 ETc irrigation in ʼKhatouniʻ , ʼZard-e- Paeizehʻ and ʼEyvan-e-keyʻ, respectively. Also, the highest TSS was obtained in ʼShiraziʻ under 33 ETc irrigation. According to the results, ʼEyvan-e-keyʻ and ʼMoziʻ, respectively were sensitive and tolerance accession to the water stress with highest (72.27 Percent) and lowest (43.4 Percent) reduction of yield under 33 percent ETc irrigation compared normal irrigation.
mehdi nazarian; Mohammad Javad Arvin; shima hasanzadehfard
Abstract
To investigate the effects of methyl jasmonate growth regulators on growth characteristics, fruit number and fruit yield of ‘Semsuri’ melon, an experiment at the field of Shahid Bahonar University was conducted in summer 2012. Melon (cv. ‘Semsuri’) is widely cultivated in Iran ...
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To investigate the effects of methyl jasmonate growth regulators on growth characteristics, fruit number and fruit yield of ‘Semsuri’ melon, an experiment at the field of Shahid Bahonar University was conducted in summer 2012. Melon (cv. ‘Semsuri’) is widely cultivated in Iran and therefore increasing the fruit yield and quality of this cultivar is necessary. Some growth regulators including Methyl Jasmonate (MJ) may improve growth and development of plants when applied at appropriate low concentrations. Thus, a complete random block experiment at the research field of Shahid Bahonar University was conducted to study the impact of 0, 2.5 and 5µM of MJ applied as seed soaking, foliar spray at 6-7 leaf stages, after fruit set and in combination with treatments on growth and fruit yield of ‘Semsuri’ melon. To promote growth and fruit yield, two times application of MJ is required. MJ reduced leaf ion leakage and increased chlorophyll index, relative water content, flesh thickness, plant fresh weight and fruit yield. Moreover, MJ significantly reduced fruit set that reduces fruit hand thinning. Most effective level of MJ was 5 µM applied at 3 stages. Compared with control, 5µM MJ reduced leaf ion leakage (42 percent), and increased chlorophyll index (45 percent), relative water content (32 percent), flesh thickness (33 percent), plant fresh weight (38 percent), root fresh weight (40 percent) and fruit yield (24 percent with two melons per plant and 19 percent with three fruits per plant).