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Potential of Piper Germplasm Against Pathogenic Bacteria: Tropical Bay Islands in India
Published in Megh R. Goyal, Durgesh Nandini Chauhan, Assessment of Medicinal Plants for Human Health, 2020
Chinthamani Jayavel, Ajit Arun Waman, Saravanan Kandasamy, Pooja Bohra
Concentration of chlorophyll pigment in a genotype is influenced by number of factors including stress level,33 nutritional content of the tissue,26 pollution and environmental stress,44 and physiological status of the plant.9 Variations in chlorophyll content in Piper species are also reported to be due to soil and micro-environmental factors, stage of plant growth, and sex of the genotype.20,32 However, during present investigation, all the genotypes were grown with uniform management practices and hence, the differences in the pigment content could be attributed to the differences in their genetic make-up. Degradation of chlorophyll17 and variation of chlorophyll content14is mainly attributed to the presence of primary enzyme, viz., Chlorophyllase. The differences observed during present investigation could possibly be due to varied levels of Chlorophyllase enzyme in the tissues of different genotypes. Findings of the present study are supported by an earlier study of 22 genotypes of P. nigrum.32
Evaluation of the optimum threshold of gamma-ray for inducing mutation on Polianthes tuberosa cv. double and analysis of genetic variation with RAPD marker
Published in International Journal of Radiation Biology, 2023
Hanifeh Seyed Hajizadeh, Seyed Najmedin Mortazavi, Morteza Ganjinajad, Volkan Okatan, İbrahim Kahramanoğlu
Gamma radiation had a significant effect on leaf chlorophyll. The highest amount of chlorophyll was obtained from controls (1.42 mg g−1 FW) followed by 20 Gy (1.10 mg g−1 FW) and 30 Gy (1.23 mg g−1 FW) (Table 3). The effect of 40 and 50 Gy radiation on the chlorophyll parameters of the flowers was significantly different from that of controls. The chlorophyll content decreased with increasing gamma dosage. The results are in agreement with Mohan Jain (2006) and Wi et al. (2007) who demonstrated that chlorophyll pigment decreased with increasing radiation levels. It seems that photosynthetic pigments are degraded by gamma radiation, which reduces photosynthetic capacity and plant germination rate. On the other hand, free radicals are likely generated inside the irradiated organs which caused to cell degradation and metabolisms, such as imbibition of the thylakoid membrane, and changes in photosynthetic and antioxidative ability (Bertolini et al. 2001). Reduction in chlorophyll in buckwheat mutants showed that chlorophyll biosynthesis decreased as the plants were exposed to gamma radiation, which stimulated the activity of chlorophyllase enzyme, increased chlorophyll decay, and finally decreased photosynthetic activity (Moghaddam et al. 2011). Jia and Li (2008) reported that the photosynthesis of pepper plants decreased in response to the increased levels of gamma radiation. However, no definite result has been observed regarding the effect of γ-irradiation on plant chlorophylls.