RELEVANCE OF ROOT CHARACTERISTICS IN IMPROVING DROUGHT ADAPTATION IN TOMATO
| dc.contributor.advisor | P. CHANDRASHEKARA, REDDY | |
| dc.contributor.author | RASHMI, K. | |
| dc.date.accessioned | 2020-10-07T08:33:29Z | |
| dc.date.available | 2020-10-07T08:33:29Z | |
| dc.date.issued | 2019-11-30 | |
| dc.description.abstract | Due to limited availability of aerable land and the high market demand for vegetables around the world, solanaceous crops are cultivated under unfavorable environmental conditions leading to reduced quality and productivity of crops. One way to reduce losses in productivity of vegetable crops would be to graft them onto rootstocks capable of reducing the effect of external stresses on the shoot. In order to achieve this, identification of suitable root stock having superior root characteristics with higher level of root intrinsic cellular level tolerance (CLT) is highly relevant under drought stress condition. In this context, 100 tomato accessions were evaluated in brick structures under normal conditions to study the genetic variability for root architecture and CLT. Study indicated a wide and significant variation among the accessions for all the root traits and CLT. Based on root dry weight, total biomass and CLT, six contrasting lines (high root lines (HRL)-Arka Ashish (ACC 100), IIHR2617 (ACC 88), IIHR 2624 (ACC 74), IIHR 2622 (ACC 72) and low root lines (LRL) -IIHR2615 (ACC 86) and IIHR2613 (ACC 84)) were identified and further subjected to different levels of soil moisture stress viz., 100, 80 and 60 % FC by gravimetrical approach at whole plant level. Physiological, biochemical and expression studies were quantified; HRL’s performed well compared to LRL’s. Additionally, selected accessions were further assessed for salinity stress (whole plant level), oxidative and high temperature stress (Seedling level). HRL showed higher morphological, agronomical and ancillary parameters compared to LRL. Further, these accessions were validated by grafting approach, three types of grafted plants were generated (hetero, homo and ungrafted) to assess the drought stress response, morphological and yield parameters were recorded and analyzed. Stress imposition caused a significant reduction in various physiological, morphological and yield parameters in low root lines as compared to high root line plants. | en_US |
| dc.identifier.other | Th-12547 | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810152757 | |
| dc.keywords | Physiological, morphological and yield parameters, quality and productivity of crops | en_US |
| dc.language.iso | English | en_US |
| dc.pages | 206 | en_US |
| dc.publisher | UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU | en_US |
| dc.sub | Crop Physiology | en_US |
| dc.theme | ROOT CHARACTERISTICS IN IMPROVING DROUGHT ADAPTATION IN TOMATO | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | RELEVANCE OF ROOT CHARACTERISTICS IN IMPROVING DROUGHT ADAPTATION IN TOMATO | en_US |
| dc.type | Thesis | en_US |