ABSTRACT
Studies on the effectiveness of age of in vitro grown seedlings on regenerative response of explants derived from them were conducted in tomato (Solanum lycopersicum L.) cv. PKM-1. The results revealed that cotyledons and hypocotyls of 10 days old seedlings were found to be superior compared to explants collected from 8, 12, 14 days old seedlings when MS medium is supplemented with BAP 1.5 mg/L + Kinetin 1.0 mg/L. These findings could be well exploited for further development of quick regenerative and transformation protocols for the tomato cv.PKM-1.
ABSTRACT
Soybean (Glycine max ( L. ) Merril) is one of the most important oil seed crop in many regions of the world including India. Good quality seed is a basic need and fundamental requirement for production of good crop. The present investigation was conducted on the seeds of 28 Soybean cultivars presently in the multiplication programme of the country with the objective to study the relationship between various seed quality characteristics. The seed samples of each cultivar were subjected to seed quality evaluation for germination, storability and field emergence. Germination % had positive correlation with field emergence.
ABSTRACT
Studies on the effectiveness of various sterilants and culture conditions on in-vitro seed germination in tomato (Solanum lycopersicum L.) cv. PKM-1 revealed that among three sterilants used, surface sterilization of seeds with 5 % NaOCl for 20 minutes was found to be more effective resulting in high germination rate and contamination free cultures. Similarly among the different media and culture conditions considered in the present experiment, MS medium without sucrose with dark incubation for three days recorded lower no. of days (3.3 days) for initiation of germination with 96 % germination. These findings could be well exploited for further development of quick regenerative and transformation protocols for the tomato cv.PKM-1.
ABSTRACT
Correlation coefficient and path analysis studies was conducted with eight parents and their 28 F1 crosses for twelve component characters including seed yield and revealed significant positive association of pods per plant, harvest index and clusters per plant with seed yield in parental generation whereas in F1 generation, significant positive association of clusters per plant, pods per plant, days to maturity, days to 50% flowering, pods per cluster and 100-seed weight with seed yield was observed. Further, it was found that number of seeds per pod, harvest index, pods per plant and number of primary branches per plant showed high positive direct effects on seed yield in parents whereas in crosses, seeds per pod, pods per plant, harvest index and days to maturity showed high positive direct effect on seed yield. Hence selection based on these traits would be effective in increasing the seed yield.
ABSTRACT
In an attempt to study the association of different quantitative traits in improving grain yield in maize hybrids, correlation and path studies were conducted between yield and yield contributing characters. Association studies revealed that, ten out of fifteen characters exhibited highly significant positive correlation with yield per plant. However, the highest correlation was evident for number of kernels per row (rp= 0.8784**). While, the traits viz., days to 50 per cent silking and days to 50 per cent tasseling displayed highly significant negative correlation with yield per plant. Path analysis revealed that, eight traits exerted positive direct effects on yield per plant. However, the trait cob length exerted maximum positive direct effect on grain yield per plant. On contrary, some of the characters viz., days to 50 per cent silking, anthesis-silking interval, leaf area index, days to 50 per cent maturity, SPAD chlorophyll and number of branches per tassel exerted negative direct effects on yield per plant. The present study revealed that, direct selection for number of kernels per row, cob length, cob girth and 100-seed weight might be rewarding for the improvement of yield using the present elite inbreds and their F1 hybrids.