Cold- or Heat-Tolerance of Leaves and Roots in Perennial Ryegrass Determined by¹H-NMR

Influence of Low/High Temperature on Water Status in Developing and Maturing Rice Grains

“…Spin-lattice relaxation time (T 1 ) and spin-spin relaxation time (T 2 ) in the samples were measured based on the procedure described by Iwaya-Inoue et al (2004a). A 1 H-NMR spectrometer with a magnet operating at 25MHz for 1 H (Mµ25A, JEOL Ltd., Tokyo, Japan) was used for the measurements of T 1 and T 2 .…”

“…The decay curve of echo signal was analyzed by using a non-linear least-square method on semi-log plots of signal intensity. For detailed analysis, two-component analysis was applied (Iwaya-Inoue et al, 2004a). For each treatment, four replications were used.…”

Changes in NMR Relaxation of Rice Grains, Kernel Quality and Physicochemical Properties in Response to a High Temperature after Flowering in Heat-Tolerant and Heat-Sensitive Rice Cultivars

“…The high temperature increased the dry weight and decreased the water content in 'Hinohikari', and both the long and short fractions of T 1 . T 1 values between 100 ms and 3 s are thought to show the existence of free water that is present mainly in vacuoles (Hills and Remigereau, 1997;IwayaInoue and Nonami, 2003;Iwaya-Inoue et al, 2004a, 2004bFunaba et al, 2006). The changes of T 1 in the 'Hinohikari' grains were closely related to the water content until the mid-mature stage.…”

“…The decay curve of echo signal was analyzed by using a non-linear least-square method on semilog plots of signal intensity. Two-component analysis by using curve fit method is described (Iwaya-Inoue et al, 2004a). T 2 was measured by the Carr-PurcellMeiboom-Gill (CPMG) method or solid echo method.…”

Biochemical and physiological constituents and their correlation in wheat (Triticum aestivum L.) genotypes under high temperature at different development stages

“…High temperature stress is a major growth restraining factor for most crop plants. Long term or even a temporary exposure to high temperature can change different metabolic functions, thereby affecting various plant parts including leaves, flower buds and roots (Tsukaguchi et al, 2003;Iwaya-Inoue et al, 2004). Most of the changes are noticeable in the cellular membranes.…”