Stability Analysis For Yield And Yield Contributing Characters Of Tomato Under High Temperature Conditions

The current study was aimed at evaluating the stability of tomato yield and yield-contributing characteristics during three sowing intervals (February, March, and April) under high-temperature regimes, Pooled analysis of variance was performed on twenty-five genotypes, including eight parents, fifteen hybrids, and two checks, for seventeen agronomic traits. Except for plant height, ANOVA findings have revealed substantial differences among tomato genotypes, with environmental conditions playing a major role on genotype performance. The genotypes differed significantly in terms of days to 50% flowering, number of flowers per cluster, and fruit length, indicating significant variability among growing seasons. Furthermore, root length showed significant genotype x environment interactions, whereas the remaining variables are found non-significant. Among the three sowing intervals, February sowing (1st interval) was found to be the most beneficial environment for tomato growth, yield, and quality features, with the highest positive environmental indices for the majority of growth, yield, and quality contributing traits. In contrast, the April sowing period (3rd interval) was found to be most unfavorable, with the highest negative environmental indices for the traits studied. This study underlined the significant influence of environmental factors on the performance of tomato genotypes, in terms of multiple yield and yield-contributing attributes. The findings emphasize the importance of choosing the optimum sowing interval, with February as the most favorable season for cultivating tomatoes in the present study location under high-temperature conditions. These findings would help to guide the decision-making process in similar agro-climatic regions to improve the tomato output and quality

Study of qualitative traits of germplasm of tomato (Solanum lycopersicum L.)

Forty genotypes of tomato germplasm under present investigation were characterized based on 11 qualitative traits viz., leaf colour, leaf pubescence, leaf / foliage cover, petiole pubescence, stem type, stem thickness, stem pigmentation, flower size, flower colour, fruit size, fruit shape. Tomato genotypes exhibited high variability for all qualitative traits viz., Leaf characters, stem characters, flower characters and fruit characters. Therefore, it is emphasized to lay attention on the traits viz., days to first flowering, number of fruits per plant, fruit weight in crop improvement programme of tomato in future

Correlation and path coefficient analysis in tomato (Solanum lycopersicum L.)

Forty genotypes of tomato were used to study the correlation and path coefficient analysis of thirteen yield and yield related traits during Kharif, 2017-18. Fruit yield per plant exhibited high significant positive correlations with average fruit weight, yield per hectare, beta carotene and lycopene. It also registered significant negative correlation with plant height, number of primary branches per plant, days to fruit set, number of fruits per plant, ascorbic acid and TSS. Path analysis revealed that the traits like number of fruits per plant and average fruit weight exhibited positive direct effects on fruit yield and these traits also recorded positive correlation with yield. This suggested that direct selection based on these traits will be rewarding for crop yield improvement

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Not AvailableTo investigate the effect of water stress on relative water content, antioxidant enzymes (Superoxide Dismutase activity and Peroxidase) and membrane leakage in twelve genotypes of sunflower a study was conducted during rabi, 2010-11 at College Research Farm, ANGRAU, Hyderabad. Water stress was imposed at flower bud initiation stage by withholding water 20 days from 40 DAS to 60 DAS, whereas, the control plots were irrigated at 10 days intervals throughout the crop growth period. With increase in stress duration RWC decreased in all the genotypes examined. However, genotype SH-177 recovered quickly from stress by maintaining high RWC. Antioxidant enzymes i.e., superoxide dismutase activity and peroxidase activity increased with stress duration and age of crop. Membrane leakage increased with stress duration and age of the crop indicating membrane damage is irreversible process. SH-177 for RWC, TSF-106 and DSF- 104 for SOD activity, DSF-111 for POX activity and ASF-107 for membrane integrity are considered as promising lines to be used in drought resistance breeding programme.Not Availabl

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Not AvailableA study was conducted to investigate the effect of drought on physiological characteristics in twelve sunflower genotypes. Moisture stress treatment were imposed at flower bud initiation stage (irrigation withheld from 40 DAS to 60 DAS) whereas, Control plots were irrigated at 10 days intervals throughout the crop growth period. Results revealed that water stress showed repressing effect on Relative water content, Photosynthetic rate, leaf fluorescence, membrane leakage, chlorophyll content and specific leaf area in all the genotypes examined. Decline in Specific leaf area under water stress is considered as adaptation to water stress. However, genotypic variation was significant for characters studied. Genotypes SH-177, SH-491 and DSF-111 was considered as promising lines by maintaining higher RWC, photosynthetic rates, leaf fluorescence and SPAD chlorophyll meter readings wither lower membrane leakage and Specific leaf areaNot Availabl

Effect of hermetic storage on seed quality maintenance of dolichos bean [Lablab purpureus (L.) var Typicus pram]

Background Dolichos bean is one of the important vegetable legume crops. During storage, protection of seed from bruchid attack is a major problem worldwide. Once the bruchid attacks, the extent of damage could be up to 100%, leading to both quantitative and qualitative loss by making it unfit for consumption. Existing traditional methods are less effective or impractical and the use of chemical methods can be harmful to the farmers and consumers. So, there is urgent need of hermetic storage method for seed quality maintenance. Keeping in view, the present study was carried out to investigate on hermetic storage practices for seed quality maintenance. Methods Triple-layer PICS technology, a chemical-free hermetic storage was evaluated for storage of dolichos bean to moisture content, germination and quality. Four different types of storage bags viz., jute bags, polythene bags, triple layer PICS bags and jute bags treated with chlorpyrifos were used for evaluating their efficacy in managing dolichos bean seed attributes. The data on various parameters pertaining to seed characteristics and changes in biochemical composition of dolichos bean seeds stored in different bags was recorded at every two month intervals for 3 times (2,4 and 6 months) by using standard protocols. Complete Randomized Design (CRD) (Snedecor and Cochran, 1967) was used for the data analysis. The data was subjected to statistical analysis as per the methods suggested by Panse and Sukhatme (1985). Result Results on moisture content showed that, in case of storage in PICS bags, there was no decrease in seed moisture content at 2, 4 and 6 months respectively and germination percent in triple-layer PICS bag at 2, 4 and 6 months storage was highest among all bag types. Test weight (g), protein content (%) and carbohydrate content (%) at 2, 4 and 6 months storage respectively were higher in triple layer PICS bag. The mean fat content recorded was highest in jute bag (1.25%) and lowest in triple layer PICS bag (0.63%). Our study concludes that the triple layer PICS bags hermetic technology is efficient in managing maintaining same level of moisture content percent, germination percent and test weight compared to other bags over 3 different periods of storage. The triple layer PICS bags are also highly useful for retaining carbohydrate percent and protein percent at almost the same levels compared to initial values

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Screening of Gene Based Markers with 23 Genotypes in Tomato (Solanum lycopersicum L)

The investigation was conducted at SKL Telangana State Horticultural University, Rajendranagar in  Kharif, 2018 using 23 tomato genotypes. Screening with Ty-1 (P6-6) marker, only one genotype i.e. AVTO-1219 showed resistant band. Screening with Ty-2 marker, only 2 genotypes viz., AVTO-1219 and AVTO-9804 showed resistant bands. Screening with Ty-1 (SSR 47) marker, 3 genotypes i.e. AVTO-1219, AVTO-9803 and AVTO-9804 showed resistant bands. Using Fw-Z 1063 marker, 10 genotypes viz., EC-615055, EC-620428, AVTO-1219, EC-620378, EC-620389, EC-620394, EC-620422, EC-631369, EC-620503 and AVTO-9803 showed resistant bands. At molecular level, these ten genotypes showed resistant bands and these genotypes contain I-2 genes