Field experiments were carried out between July and December 2010 and 2011 at research station of the Institute of Agricultural Research and Training, Obafemi Awolowo University, Moor Plantation, Ibadan, to determine the effects of time of harvesting on kenaf seed physiological maturity and quality. Kenaf seed of 10 genotypes were collected at seven harvesting periods. Seeds were harvested at 5 day interval from 15 to 45 days after flowering (DAF). Significant variation was observed in all the kenaf genotypes for all the parameters studied. Maximum seed quality as measured by seed viability, moisture content, seed mass and germination percentage were obtained at 35 DAF. However, seed quality of kenaf genotypes reduced thereafter with age and pre-harvest sprouting on mother plant occurred. Maximum seed weight (mass maturity) was achieved at 35DAF in both years when average seed moisture contents were 20.58 and 19.28%, respectively. For high seed quality, kenaf is better harvested at 35 DAF which could be regarded as the point of physiological maturity.
Now a day’s green synthesis of silver nanoparticles (AgNPs) from plants has an important role in biomedical science, drug discovery and also in biological field. In this investigation, we synthesize AgNPs using the aqueous solution of the leaf extract of 4 indigenous plant samples such as –Abroma augusta, Barringtonia acutangula, Dillenia indica & Eupatorium odoratum in room temperature (35±2°C). After that, formation of AgNPs were confirmed by UV-VIS spectrum, the answered (435, 445, 430 & 440 nm), respectively. The average size of the AgNPs also confirmed by Particle size analyser (PAS), the B. acutangular species showed the best quality of silver nanoparticles among the other plant extracts. FTIR analysis showed that five biomolecule groups like phenols, aromatic, alkyne, alkane and alkene were found in among these plant samples. Our findings suggest that the seed germination percentage, relative seed germination rate, relative shoot & root growth and germination index of the tested plant depends upon concentration gradient of synthesize AgNPs. At 0.6 mg/ml concentration, the tested plant samples give the best favorable growth condition.
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