Ecophysiological Investigation on Effect of Water Stresson Eight Local Chickpea Accessions (Cicer Arietinum L.)
| dc.contributor.advisor | Fetene, Masresha(PhD) | |
| dc.contributor.author | Feleke, Yonas | |
| dc.date.accessioned | 2018-07-17T13:08:07Z | |
| dc.date.accessioned | 2023-11-08T16:32:46Z | |
| dc.date.available | 2018-07-17T13:08:07Z | |
| dc.date.available | 2023-11-08T16:32:46Z | |
| dc.date.issued | 1999-06 | |
| dc.description.abstract | Chickpea (Cicer arietillulIl L.) plants were subjected to three watering regimes in order to evaluate effects of water stress on growth parameters, water relations, chlorophyll a fluorescence of PSI! and drought induced gene expression under glasshouse conditions. A .total of eight accessions were considered for the growth and physiological studies. Water stress result in reductions of plant height branch number, leaf number, biomass accumulation, total leaf area and relative growth rates. Biomass allocation to leaves, stem and root did not differ between well-watered and stressed plants. Biomass partitioning to pods showed an increasing trend with stress level but it was not significant except in one accession (Ac3). Stomatal conductance declined with stress. Leaf water potential reached as low as -2.5 MPa in severely stressed plants, which had relative water content (RWC) between 50 - 60%. Analysis of chlorophyll a fluorescence showed that maximal photochemical yield (Fv IFm) was not affected by water stress. However, there was a slight decrease in Fv/Fm ratio in the dark. On the other hand, quantum efficiency (Ll.F/Fm') declined substantially under water stress in most accessions. Moreover, diurnal reduction in Fm (maximum fluorescence) was observed indicating the existence of mechanisms for thermal dissipation of excess energy at . high irradiance. Water stress reduced seed yield by reducing the number of pods per plant. However, number of seeds per pod was not affected although smaller seeds were harvested in severely stressed plants. It is concluded that out of the studied physiological attributes, stomatal conductances, RWC, quantum efficiency and cell membrane stability tests showed intraspecific variations indicating that they could be used for selection of resistant types. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/9057 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Biology | en_US |
| dc.title | Ecophysiological Investigation on Effect of Water Stresson Eight Local Chickpea Accessions (Cicer Arietinum L.) | en_US |
| dc.type | Thesis | en_US |