Effect of seedling age and water depth on morphological and physiological aspects of transplanted rice under high temperature

Abstract

To study the effect of high temperature, rice seedlings 20, 30, 40 and 50 d were kept at 5, 10, 15 and 20 cm water depth in a water pool. Meteorological findings indicated that water temperature varied up to 10 cm but became stable below this depth. Deep water inflicted higher tiller mortality, minimal increase in dry weight of aerial parts and leaf area, decrease in root length, and decrease in root dry weight especially at 20 cm water depth and produced an unbalanced T/R ratio (top versus root dry weight). However, deep water tended to increase plant length. These parameters, however, excel in shallow water. Older seedlings, with the exception of root dry weight, could not perform well compared to young seedlings in all physiological and morphological aspects. The study revealed that seedlings, particularly young ones, stand well in shallow water and can cope with high temperature.

Evaluating the sensitivity of vegetation and water indices to monitor drought for three Mediterranean crops

“…development of the crops when compared to regional norms (Khakwani et al, 2005). Satellite remote sensing is a promising method to provide consistent spatial and temporal assessment of vegetation conditions for large-scale drought monitoring (AghaKouchak et al, 2015;Wardlow, Anderson, & Verdin, 2012;Zhou et al, 2017).…”

“…Critical climate and crop response information obtained at important phenological periods (e.g., bud break, flushing, flowering, and fruit development) is important for developing practices of best water use during drought periods (Cautin & Agusti, 2005; Perez‐Pastor, Ruiz‐Sanchez, Domingo, & Torrecillas, 2004; Torrecillas, Domingo, Galego, & Ruiz‐Sánchez, 2000). From this perspective, the phenology of citrus, grape, and olive is easily affected by environmental (e.g., drought) and management (e.g., irrigation) factors that can lead to complications in the development of the crops when compared to regional norms (Khakwani et al., 2005).…”

Genetic Diversity and Relationships among Local Olive (<i>Olea europeaea</i> L.) Genotypes from Gaziantep Province and Notable Cultivars in Turkey, Based on SSR Markers

“…As well known, almost all morphological and biochemical characters are controlled by minor polygenic traits and are easily affected by environmental factors. Farming practices, age and developmental stages of plants affect morphological and biochemical characters as well (Khakwani et al, 2005;Kaczmarka et al, 2015;Nemli et al, 2015).…”

Genetic relationships among turnip (Brassica rapa var. rapa) genotypes

“…Farming practices and age and developmental stages of plants affect morphological characters as well (Gottlieb, 1984;Khakwani et al, 2005). In addition, more recent intensive plant breeding has resulted in a few dominant cultivars and has narrowed the genetic diversity among cultivars (Reif et al, 2005).…”