Varietal Differences in Biomass Production of Rice Early After Transplanting at Low Temperatures

Nursery Management for Improving Seedling Length and Early Growth after Transplanting in a Semi-Dwarf Rice Cultivar Hokuriku 193

“…Plant length and shoot dry weight at 3 wk after transplanting were markedly smaller in 2011 and 2013, compared to those in 2012. These results confirmed that air temperature significantly affects plant growth, as supported by the previous studies (Hiraoka et al, 1987;Redoña and Mackill, 1996;Ohsumi et al 2012). In the present study, both H and N treatments contributed to elongation of seedlings under any climatic conditions, while the increase in seedling length was greater in the H-treated plants.…”

“…Because Hokuriku 193 is not suitable for direct seeding due to its deep dormancy and low establishment rate, transplanting culture would be adequate for ensuring its high yield potential (Goto et al, 2009). The seedlings of the indica-dominant high-yielding cultivars, including Hokuriku 193, are shorter than those of the japonicadominant cultivars (Cui et al, 2000;Ohsumi et al, 2012); the former become still shorter at low temperatures in the nursery period with early transplanting time (Hiraoka et al, 1987;Redoña and Mackill, 1996), although by transplanting 2 wk earlier than the usual time the yield becomes stable and high in Hokuriku 193 (Ohsumi et al, 2014). Now, farmers face several problems after transplanting the very short seedlings of Hokuriku 193 where the seedlings are grown at a low temperature.…”

Influence of temperature and solar radiation on grain yield and quality in irrigated rice system

“…Low temperature in vegetative stage slowed down the leaf expansion, reduced leaf number and markedly diminished total N uptake at maturity (Shimono et al, 2007(Shimono et al, , 2012. In addition, it also increased the rice plant susceptibility in panicle development, induced spikelets sterility, decreased biomass tremendously, and eventually damaged rice grain yield and quality (Shimono and Kanda, 2008;Ohsumi et al, 2012;Horai et al, 2013;Huang et al, 2013). In addition to low temperature, high temperature at and after flowering is quite detrimental to rice growth.…”

QTLs for Shoot Length and Chlorophyll Content of Rice Seedlings Grown under Low-Temperature Conditions, using a Cross between Indica and Japonica Cultivars

“…Of them, indica originated in the tropical area, and is considered to be more sensitive to low temperatures than japonica, which is adapted to the temperate area (Mackill and Lei, 1997;Zhao and Takahashi 1999;Ohsumi et al, 2012). Indica cultivars generally have bigger heads and are used as mother plants to improve yielding capacity (Nagata et al, 2002;Ando et al, 2008;Terao et al, 2010).…”

“…Additionally, a low correlation between low-temperature germinability and cold tolerance at the seedling stage has been reported (Bertin et al, 1996;Wang et al, 2011). Furthermore, the germinability rate of indica cultivars in cold conditions is not low (Miura et al, 2001;Baruah, et al, 2009;Wang et al, 2011), but the growth rate at the seedling stages is limited under low temperatures (Ohsumi et al, 2012). Therefore, identification of the genes that affect the seedling growth rate after germination at low temperatures is important for the improvement of indica cultivars.…”