ABSTRACT
This research focuses on the functional characterization of 19 rhizobia strains isolated from Southern Rajasthan's Udaipur and Dungarpur districts, with an emphasis on their multiple Plant Growth Promoting (PGP) activities. Through a series of tests encompassing Indole-3-Acetic Acid (IAA) production, siderophore production, phosphate solubilization, ammonia production, and hydrogen cyanide (HCN) production, this study elucidates the diverse PGP potential of these rhizobia strains. The results showcase variations in IAA production, highlighting their ability to enhance root development and overall plant growth, while also revealing strains capable of siderophore production, indicating potential iron uptake facilitation. Furthermore, some strains exhibit phosphate solubilization, ammonia production, and HCN production capabilities, signifying their potential to improve nutrient availability and protect plants from pathogens. These findings underscore the promise of harnessing the PGP activities of these rhizobia strains for sustainable agricultural practices in Southern Rajasthan and similar agroecological regions, with implications for enhanced crop yields and soil health.
ABSTRACT
Rice (Oryza sativa L.) is a staple food for most countries, originated from tropical areas and sensitive to low-temperature or temperate regions. A field experiment was conducted in at ARS, Ganagavathi, UAS, Raichur, Karnataka for two consecutive years (2020&2021). The experiment was laid out in two factorial randomized block design (RBD) in two dates of transplanting that is Kharif (K-15th September) and late-Kharif season (LK-30th September) with four varieties i.e., GNV-10-89 and GNV-1108 (short duration) and GNV-1801 and BPT-5204 (long duration) in three replications. The low-temperature at reproductive stage of late-Kharif season was 14±1oC., the results obtained at reproductive stage, proline content was higher in LK than K. Long duration varieties showed higher than short duration varieties. The total soluble sugar was higher in K and lower in LK, short duration varieties possessed higher than long duration varieties. The antioxidants activity like catalase (EC 1.11.1.6), peroxidase (EC 1.11.1.7), ascorbate peroxidase (EC 1.11.1.11) and super oxide dismutase (EC 1.15.1.1) was higher in the low-temperature stress condition that is LK than K and among varieties, long duration varieties showed higher antioxidants activity than short duration varieties. Photosynthetic rate and transpiration rate was higher in K and lower in LK, short duration varieties obtained higher than long duration varieties. Grain yield per hill was higher in K than LK and short duration varieties recorded higher than long duration varieties. This study concludes that the low-temperature encounter the reproductive stage of long duration varieties transplanted in LK.
ABSTRACT
Pulses have been described as a "poor man's meat and affluent man's vegetable" in India. Chickpea (Cicer arietinum L.) is the third most legume crop grown during rabi season under receding soil moisture. Chickpeas is known to flourish in drought-prone conditions, but it seems to be sensitive to heat stress exceptionally during reproductive development, resulting in considerable yield loss. The performance of chickpeas under heat stress is more variable. It is crucial to develop screening tools to identify thermotolerant chickpea genotypes because of the increase in average global temperatures. In this view, a lab experiment was conducted to standardize the temperature induction response (TIR) protocol for chickpea seeds. The 70 % hydrated seeds were used for the experiment. This technique can be used as a potential tool to identify and select temperature tolerant lines at the seed stage itself from a large population. A set of six chickpea genotypes were screened for intrinsic tolerance using the standardized Thermo Induced Response (TIR) protocol. Among the genotypes JG-14, JG-11 and A-1 showed highest thermo tolerance in terms of higher survival of seeds (germination percentage) and seedlings with less per cent reduction in seedling survival, root and shoot growth. The genotypes with intrinsic heat tolerance can be explored for the development of varieties suitable for late sown conditions in Karnataka where chickpea is prone to terminal heat stress. The results of the study concluded and standardized the sub lethal temperature as 32 ºC to 50 ºC for 5 hours and 30 min, lethal temperature i.e., challenging temperature as 58 ? for 3 hours and LD 50 as 52 ? for 3 hours at seed level itself.
ABSTRACT
The current investigation on the repercussions of drought stress on the growth parameters of the Moth bean (Vigna aconitifolia) has been carried out in a semi-field condition. Two sets of local moth bean cultivars (RMO-40: fifteen in each) were prepared, and one was subjected to terminal drought stress. The rest was maintained with proper watering as a control set. The treated plants were thoroughly evaluated based on leaf length, root length, and relative leaf water content in comparison with the control ones. The findings of this study reveal a significant impact of drought stress on moth bean's growth and physiological performance. Under drought conditions, treated plants exhibited considerable reductions in leaf length and root length compared to their well-watered counterparts. Additionally, the relative leaf water content declined under drought stress, indicating decreased water uptake and retention within the plants under stress. These outcomes underscore the vulnerability of moth bean to drought stress, emphasizing the urgency of developing efficient water management strategies and drought-resistant varieties to safeguard food security in regions where this legume serves as a staple crop. This research highlights the importance of understanding the adverse effects of drought stress on moth bean's growth parameters for sustainable agriculture and food production.
ABSTRACT
A field experiment was carried out on the Instructional Farm, which finds its location intricately linked to the Department of Fruit Science at the esteemed College of Horticulture and Forestry in Jhalarapatan, a prominent site within the Jhalawar region. during (2021-22 and 2022-23) with the object of assessing the response of foliar humic acid on growth attributes of Jamun (Syzygium cumini (L.) Skeels) cv. Goma Priyanka. Four doses of Potassium silicate (KS) 0, 1000, 2000 and 3000 ppm were tried in 4 treatments in a factorial randomized block design. The foliar response of Potassium silicate KS3 (3000 ppm) treatment registered relatively better plant growth parameters viz. rootstock girth, scion girth, plant height, canopy volume, canopy spread E-W, N-S, of Jamun cv. Goma Priyanka plants.