Different root low temperature response of two maize genotypes differing in chilling sensitivity

Water relations and an expression analysis of plasma membrane intrinsic proteins in sensitive and tolerant rice during chilling and recovery

“…In figleaf gourd [12] and chilling tolerant maize [3,4], long-term chilling treatment resulted in an even larger root Lp than unchilled control plants. This overcompensation in root water transport may be a type of cold acclimation in chilling tolerant plants.…”

“…How plants integrate these mechanisms in response to chilling is a challenge for future research. Several reports suggested that aquaporins were necessary for chilling responses [4,6], but the roles of aquaporins in chilling tolerance was still elusive. PIP genes did not exhibit a uniform expression pattern (Figure 3 and Figure 4), suggesting that PIPs did not respond in a simple uniform way but have more complex roles in influencing plant water balance during chilling.…”

“…Many reports have emphasized the changes in water relations because water homeostasis is essential for plant survival under this stress condition, and a significant symptom of chilling injury is shoot water deficit resulting from imbalance between water transport and transpiration [2]. It has been well documented that root water transport is sharply suppressed by exposure to low temperature in a number of species, including maize [3][4][5][6], rice [7], bean [8], spinach [9], aspen [10], cucumber and figleaf gourd [11,12]. Some studies have also demonstrated that a decrease in transpiration follows the reduction in root water flow [5,10].…”

“…The composite water transport model proposes that water channels play a role in cell-tocell water flow under adverse environmental conditions when low transpiration and xylem tension occurs [17,18]. Aquaporins have previously been reported to be involved in chilling responses [4,19] but only recently have comprehensive analysis of aquaporin expression at the mRNA level in response to low temperature been done. Techniques used were Northern blot, semi-quantitative reverse transcription (RT)-PCR and real-time RT-PCR using SYBR green dye in species such as Arabidopsis [20], maize [6] and rice [7].…”

Alleviating effects of exogenous Gamma-aminobutiric acid on tomato seedling under chilling stress

“…Low temperature during germination and early seedling growth is one of the most significant limiting factors in the productivity of plants (Aghdam et al 2012) and induces considerable changes in biochemistry and physiology of plants such as damage to membranes, generation of reactive oxygen species (ROS), protein denaturation and accumulation of toxic compounds at various organizational levels of the cells (Nayyar et al 2005). Antioxidant capacity increases during cold acclimation in several plants as an adaptive mechanism to low temperature (Foyer and Noctor 2005;Aroca et al 2001). Malondialdehyde (MDA) is produced when polyunsaturated fatty acids in the membrane undergo peroxidation (Foyer and Noctor 2005).…”