Field Screening of Rice Germplasm (Oryza sativa L. ssp. japonica) Based on Days to Flowering for Drought Escape

Abstract

Terminal drought stress is one of the restrictive factors in rice production and is expected to upsurge under the current situation of climate change. The study evaluated the performance of 2030 rice genotypes under continuous drought stress conditions based on days to flowering (DF). The genotypes under augmented randomized complete block design were sown in May/June of 2017 and 2018 in the field with movable rainout that resulted in huge genetic diversity among the accessions. Descriptive statistics confirmed clear variation among accessions on growth duration, plant height to leaf, plant height to panicle, and germination percentage. Correlation, chemometric, and agglomerative hierarchical cluster analyses were performed that categorized the germplasm into 10 groups. Genotypes in clusters VIII and IX (drought-resistant) revealed better agronomic performance in terms of reduced days to flowering, but conversely taller plant height and higher maturity (%) under severe stress. Genotypes in clusters IV, V, and X were discovered to be drought-susceptible. The screened genotypes like Longjing 12, Longdun 102, Yanjing 22, Liaojing 27, Xiaohongbandao, Songjing 17, and Zaoshuqingsen can be utilized in rice breeding improvement programs for drought tolerance in terms of severe continuous drought, as well as terminal drought stress.

Identification of Drought Tolerance on the Main Agronomic Traits for Rice (Oryza sativa L. ssp. japonica) Germplasm in China

“…For this, core yield attributes of rice are pertinent for drought identification and screening consist of the following: plant height to leaf and panicle (PHL and PHP), aboveground biomass plant −1 (ABP −1 ), grain yield plant −1 (GYP −1 ) and harvest index (HI). Days to flowering (DF) are imperative as well, while breeding for drought stress at the terminal phase as this assist drought escape [23]. This is the first time an integrated selection based on combined results from RDS, drought resistance grade (DRG) and AHC from large-scale rice germplasm under lowland and upland conditions applying augmented randomized complete block design (ARCBD) has been made.…”

Effect of Qiangdi 863 Nanosynergids Treated Water, Nitrogen, Phosphorous and Potassium Fertilizers on Rice Growth Physiology and Grain Quality

“…Nanomaterials act as agrochemical agents which can effectively increase production alongside lesser consumption of nitrogen fertilizers. Advanced cultivation methods could be used to increase the yield of a crop, to avoid excessive damage to soil and water, minimize the nutrient leaching, and to increase the yield ( Mahil et al, 2019 ; Ahmad et al, 2020 ). The objective of the study was designed to examine the effects of Qiangdi nano-863 nanosynergids-treated water in combination with NPK fertilizers on five varieties; one from China and four from Pakistan were selected.…”