Aim: The present study was conducted to develop the planting material standards of lasoda cultivar ‘Thar Bold’ for commercial orcharding in India. Methodology: The ripe fruits at pink colour appearance from mother tree of lasoda ‘Thar Bold’ were collected from Experimental Block-I after 75+5 days after fruit set during last week of May- first week of June months for raising of seedlings. Fruits and seeds were categorized based on size and weight and accordingly seeds sown in field bed and root trainers. At two true leaf stage, the seedlings were shifted in polybags for working out seed and rootstock standards. Further, to develop the planting material standards, the scion buds of current season’s growth were collected and budded during third week of May, June and July. The standards were prepared on the basis of all possible traits of the interest. Results: Under the present study, planting material standards of lasoda were developed with following prerequisites: ripened fresh fruits should have diameter > 1.5 cm and fruit weight > 6 g with seed germination > 60 %; buddable seedlings/ rootstock of 9-12 months should have about 35-40 cm height and 0.8-1.0 cm girth; budding should be done during May-June months; at 90 days of budding, plants with sprouts length ≥ 50 cm and diameter ≥ 0.5 cm should be good for field planting in the same season. Interpretation: The developed standards of lasoda would be highly useful for conservation of elite type and large scale multiplication of quality planting material for commercial orcharding in the country.
Aim: Identification of Jamun (Syzygium cumini L. sleeks) resistant genotypes against important fruit borers, Meridarchis scyrodes and Dudua aprobola for their sustainable management. Methodology: Twenty-six genotypes of Syzygium cumini from the gene bank were tested for resistance against fruit borers. Randomly fruits were collected from three plants of each genotype and mean incidence of fruit borers Meridarchis scyrodes and Dudua aprobola was recorded along with biophysical structures. The collected fruits were also analyzed for antixenotics and allelochemical biomolecules. Results: On the basis of resistance scale, 5 genotypes were resistant, 11 were moderately resistant; 7 were susceptible and 2 were highly susceptible to fruit borers (M. scyrodes and D. aprobola) infestation. The infestation in different genotypes was negatively correlated with phenols, flavonoides, tannins and alkaloids, while it was positively correlated with fruit length, fruit width, pulp thickness and pulp: stone ratio. The phenolic and tannin content explained 93.30% of genotypic variability against M. scyrodes infestation while the genotypic variability explained 81% due to phenolic content followed by tannin content 10.4 % against D. aprobola infestation. Interpretation: The jamun genotypes (GJ-27 & GJ-17) comes out as resistant against fruit bores with minimal infestation that can be used as breeding material for development of high yielding and borer resistant jamun varieties with higher antioxidant activity. We can use the jamun genotypes that resistant to fruit borers with minimal investment to get high yield under good agricultural practices. Therefore, resistance to fruit borers jamun genotypes can be used as part of sustainable management or integrated pest management.
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