Comprative study on rice germination and seedling growth under salinity and drought stresses

Abstract

R ICE is very important crop in Egypt and the production of rice yield faced many challenges such as, saline soil and drought. For salinity about 30% of lands affected by salinity specially northern part of delta, besides, in Egypt the people increase continuously but the water sources are constant so year by year the problem increase. The rice cultivars differed in salinity and drought tolerance in the various stages of plant life, so, study of rice tolerance in germination and seedling stage play a vital role to rice breeder to select good rice donors to improve tolerance to salinity and drought. This investigation was carried out in the lab of Rice Research and Training Center (RRTC), Sakha station, Kafrelsheikh, Filed Crops Research Institute Egypt, during 2017 and 2018 seasons, to study the inheritance of some germination and early seedling traits associated with salinity and drought tolerance. Eight rice genotypes namely; Sakha102, Sakha104, Sakha105, Sakha106, Giza178, A22, IRAT170, and WAB56-125 were evaluated under salt solutions (NaCl) of distilled water as a control, 3.5 or 7dSm-1 salt concentrations according to the treatments and drought stress caused by two concentration of sorbitol (10 and 20 ml/l). Significant genetic variation was found among rice cultivars for seedling vigor under salt and drought stress conditions. Thus, could use the tolerance verities in breeding program to improved tolerance to salinity and drought. The phenotypic coefficient variability (PCV %) was higher than genotypic coefficient variability (GCV %) for all traits, indicating the existence of wide genetic variability among these genotypes. This study indicated that the rice variety A22 followed by WAB56-125 were the most tolerant to salt and drought stress conditions. Meanwhile, Sakha104 could use a good donor underwater deficit in breeding programs.

Combining Ability and Heterosis Studying for Yield and its Attributes of Hybrid Rice Under Normal and Salinity Conditions Using Line × tester Scheme

“…Concerning potassium content, the best genotype was the cross GAB-A/Giza179 under normal, salinity conditions. Some authors like, Zayed et al, (2010Zayed et al, ( ,2014Zayed et al, ( and 2017; Negm (2012 and2016); El-Mowafi et al, (2019 and2022) and Mazal et al, (2021) mentioned similar findings.…”

“…Rice is a very important crop in Egypt and the production of rice yield is facing several challenges such as saline soil and drought. Furthermore, about 30% of lands in northern part of delta are salt affected soil (Negm et al, 2019). Accordingly, salinity considered one of the major abiotic stresses affecting rice sustain-ability and yield.…”

Adaptation and Selection Early and High Yielding Production of Some Exotic Rice Genotyps Under Egyption Conditions

“…The estimates of genetic parameters including coefficient of variation and heritability deserve attention in deciding selection criteria for improvement in the concerned characters. Estimates of genotypic variance (σ 2 g), phenotypic variance (σ 2 p), genotypic coefficient of variation (GCV), phenotypic coefficient of variation (PCV) and broad sense heritability (H 2 ) are shown in Table 6 and Tuhina- Khatun et al, (2015) and Negm et al, (2019), who reported that genetic variance (𝜎 2 g) was higher than the environmental variance (𝜎 2 e). The phenotypic variance in a population is estimated using heritability analysis, which also quantify the relative contributions of genetic and non-genetic component differences.…”

Enviro-economic Assessment of Microbiomes and K-Humate for Salinity Stress Amelioration and Productivity Enhancement in Wheat and Faba Bean in the Northeastern Delta of Egypt

“…Global climate change and intensive agricultural practices have exacerbated the impact of abiotic stresses such as drought, salinity, UV rays, low and high temperatures that increase soil and water salinity especially in arid and semiarid areas and act as limiting factors that hinder plant growth and decrease agricultural productivity by 20% and 50% [1].These stressed conditions of soil salinization have grown up in Egypt to represent about 46% of the total Nile Delta zone due to the complex environmental risks from climate change and human-caused developments in addition to water scarcity problems [2,3]. Nowadays in Egypt, there is a tendency to expand the cultivated area of many crops in Northeastern Delta of Egypt, including wheat and faba bean in newly-reclaimed soil, Disclaimer/Publisher's Note: The statements, opinions, and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s).…”