RÉSUMÉ
Stomata are probably a viable taxonomy distinguishing feature. The study of stomata characteristics of synthetic banana hybrids and their parentage has been carried out. Ploidy determination is essential in banana breeding programs to understand the genetic makeup of hybrid plants. The purpose of this study was to determine the ploidy level of hybrids in contrast with the properties of plant stomata in synthetic banana hybrids with those of their parent plants. Therefore, by examining components such as stomata location, number of epidermal cells, number of stomata cells, stomata length, width, area, intensity and density, as well as chloroplast count, it is possible to compare and contrast the traits of synthetic banana hybrids and their parentage which have different genomes. The entire mount approach was used to make an incision for the purpose of observing stomata. By characterising the stomata traits of the synthetic hybrids and their parentage, the results were then descriptively and qualitatively assessed. Three different locations on the abaxial of the leaf were taken for the determination. The samples were collected from close to the petiole (R1), middle (R2), and distal end (R3), stomata were observed using the replica method. Results showed that more number of stomata was observed in R2of leaf abaxial. The chloroplast count in pairs of stomatal guard cells from the accessions was also measured. The chloroplast density was determined in pairs of stomatal guard cells from the accessions. Based on morphological descriptions, it was observed that 16.66% of the accessions were diploid, 50% were triploid and 33.33% were tetraploid. When considering the chloroplast count, the accessions were categorized into groups, certain accessions classified as tetraploids, others as triploids, and diploids.
RÉSUMÉ
Cashewnut (Anacardium occidentale L.) is an export-oriented plantation crop. The VRI-3 cashew plantation, utilizing a 7 x 7 m low-density (LD) system with approximately 200 plants ha-1, falls short of meeting the country's import and export demands. Consequently, a high-density planting (HDP) system was developed in Tamil Nadu to enhance India's cashew production. Further advancement through ultra-high-density planting (U-HDP) has proven effective, achieving a plant population of about 1250–1600 plants per hectare. In addition to the increased number of plants in the U-HDP approach, morphological characteristics such as tree height, trunk height, trunk girth, and canopy ground coverage were studied. The impact of these morphological changes resulting from an increased tree population on physiological parameters like Leaf Area Index (LAI) and light extinction coefficient (k) was also analysed. This analysis was carried out using the ‘Ceptometer’ model AccuPAR LP-80 device, aiming to determine how these changes might interfere with productivity and subsequently influence the cashew plantation's production capacity.
RÉSUMÉ
Crepe jasmine or East Indian rosebay or pinwheel flower, Tabernaemontana divaricata originated from India is a popular large shrub or a small tree grown in tropical and sub-tropical gardens for its beautiful glossy foliage and mild fragrant waxy white, ornamental flowers. It produces flowers throughout the year, except in winter but profusely during summer season. Rather than the opened flowers, the unopened flower buds are commonly used as an alternate to Jasminum sambac buds in off-season. The present investigation was carried out at the Department of Floriculture and Landscape Architecture, Horticulture college and Research Institute, Tamil Nadu agriculture university, Coimbatore during 2022-2023. Randomized Block Design was used with three replications with the objective of investigating promising genotypes of Tabernaemontana divaricata, collected based on the type of petals from different locations for loose flower production. In the study totally 12 accessions were collected and named from Acc. No. 1 to 12. They are evaluated for their vegetative and floral parameters such as plant height, leaf length, leaf width, no. of branches, plant spread in EW & NS direction. Floral parameters include bud length, bud diameter, stalk length and no. of petals/flower. Out of the collected accessions, Acc. No. 2 & 5 are suitable for veni arrangement and Acc. No.10 & 11 are suitable for garland making. Buds of acc. No.4 & 6 are similar to Jasminum sambac and J. auriculatum buds.
RÉSUMÉ
The present investigation was carried out in Tamil Nadu Agricultural University, Coimbatore to study the “Genetic variability and correlation analysis in Mithipagal (Momordica charantia var. muricata) genotypes”. Observations on vine length, days to male flower inflorescence, days to female flower inflorescence, node of first male flower appearance, node of first female flower appearance, sex ratio, number of fruits per vine, fruit weight, fruit length, fruit girth, number of seeds per fruit, yield per vine, ascorbic acid, protein content, iron content and total soluble solids were recorded. Variability and correlation analysis among genotypes were examined. The results, showed that yield per plant had high positive and high significant correlation with fruit weight, fruit girth, number of seeds per fruit, vine length and fruit length. High genotypic co-efficients of variation (GCV) were found for fruit yield per vine, fruit weight, TSS, fruit length, vine length, fruit girth, node of first female flower, number of fruits per vine, number of seeds per fruit, iron, protein content when genetic characteristics were taken into account, However low GCV was found for days to the first male and female flowering. Phenotypic variants were always greater than genotypic variances. For traits such asyield per vine, fruit weight, TSS, fruit length, vine length, fruit girth, number of fruits per vine, number of. seeds per fruit, node of first male flower appearance, node of first female flower appearance, sex ratio, vitamin C, protein, iron content high heritability was found together with high genetic advance in percent of mean, indicating that these features are under additive gene control and hence selection for genetic improvement would be successful. Node of first male flower appearance showed low heritability combined with low genetic advance as a percentage of the mean indicating that non-additive gene effects were involved in the expression of this trait and hence selection for such a trait could not be beneficial. The knowledge of these statistical factors would be useful in identifying genotypes with greater yield potential that might be used in the improvement of mithipagal.
RÉSUMÉ
An investigation entitled, “Effect of different rootstocks and scion compatibility study on Rosa sp.’’ was conducted to study the graft compatability and growth performance of grafted rose plants and the experiment was conducted in Vegetable Research Station, Tamil Nadu Agricultural University, Palur, Cuddalore district, Tamil Nadu during the year 2022. It was carried out using completely randomized design (CRD) with fifteen treatments (T1- Andhra red rose + Dog rose, T2-Andhra red rose + Button rose, T3-Andhra red rose + Ebb tide rose, T4- Andhra red rose +Fairy rose, T5- Andhra red rose + Edward rose, T6- Edward rose+ Dog rose, T7-Edward rose + Button rose, T8-Edward rose+ Ebb tide rose, T9-Edward rose + Fairy rose, T10-Edward rose+ Edward rose, T11-Damask rose + Dog rose, T12-Damask rose + Button rose, T13-Damask rose + Ebb tide rose, T14-Damask rose+ Fairy rose, T15-Damask rose+ Edward rose) and two replications. The results indicated a significant difference between the different treatment combination for graft union, success percentage, survival percentage, plant height (cm), leaf length (cm), leaf width (cm), days taken for leaf initiation. The experiment data revealed that the maximum graft success (90) and graft survival percentage (80), length of leaves (3.9 cm) and plant height (67.6) was recorded in the treatments T7 (Edward rose + Button rose). It can be concluded that the combination of rootstock as Edward rose and scion as Button rose is said to be most compatible and can be recommended for commercial cultivation.
RÉSUMÉ
Aim: Okra is a vegetable that holds a significant share in both domestic and export markets, but it is prone to desiccation and fungal spoilage, leading to a short shelf life. A laboratory study was undertaken to determine the effects of hexanal containing aqueous formulation to improve the shelf life of okra with the objective to maintain the best quality of pods for end consumer acceptance.Study Design: Factorial Completely Randomized Design was followed with three replications.Place and Duration of Study: The study was conducted in laboratory conditions, Department of Vegetable Science, Horticultural College and Research Institute, Coimbatore during 2021-2022Methodology: In this study, TNAU released nanoformulation– TNAU FRUITY FRESH – ENHANCED FRESHNESS FORMULATION consisting of 2% Hexanal, 10% Formulation ingredients, 88% Deionized filler. and hexanal was used at varying concentrations for imposing treatments on freshly harvested, uniform sized undamaged tender pods of bhendi hybrid COBh H4 (TNAU released hybrid) using spray and dip methods under ambient and cold storage conditions and physiological parameters were assessed.Results: As per the investigation, 2% Enhanced Freshness Formulation using dip method in cold storage conditions slower the physiological loss in weight, preserves the L*, a*, b* value, extend the shelf life and preserved the quality for consumer acceptance during storage 9 days as compared to control.Conclusion: The study gave the knowledge of hexanal containing aqueous formulation and their effectiveness to use as post-harvest technology tool for okra.
RÉSUMÉ
This study aimed to enhance the durability of selected green leafy vegetables, including Lettuce and Palak, by manipulating influential factors such as storage conditions (Ambient (35±5°C) and Refrigerated (5±5°C)), packing substrate (Low-density polyethylene and High-density polyethylene covers), and gas composition using modified atmosphere packaging. Factorial completely randomized design (FCRD) was employed, incorporating a total of 12 treatments for each crop. The evaluation primarily relied on calculating physiological weight loss. Lettuce showed optimal results with treatment T5 (0.38%) exhibiting superior performance, followed by T6 (0.45%) and T3 (0.58%) under ambient conditions. Similarly, for palak, T5 (0.18%) outperformed T3 (0.19%) and T2 (0.37%). Thus, it is advisable to adopt T5 (R1G3M1) as the preferred treatment with T3 (R1G2M1) as a viable alternative for ambient storage conditions. Refrigerated lettuce performed optimally with T11 (0.54%) leading, followed by T7 (0.56%) and T9 (0.69%). Similarly, palak exhibited superior results with T9 (0.61%) in the fore, succeeded by T11 (0.77%) and T7 (0.97%). Notably, produce stored under ambient conditions had a relatively short shelf life of approximately 5 days, while refrigeration extended it to 15 days, after which a decline in quality was observed across all treatments. Therefore, refrigerated produce has an extended shelf life, with T9 (R2G2M1) followed by T7 (R2G1M1) yielding highly favorable outcomes.