TY - JOUR
T1 - Responses of grain filling in spring wheat and temperate-zone rice to temperature
T2 - Similarities and differences
AU - Kobata, Tohru
AU - Palta, Jairo A.
AU - Tanaka, Tomoyuki
AU - Ohnishi, Masao
AU - Maeda, Miki
AU - KoÇ Cedilla, Müjde
AU - Barutçular, Celaleddin
N1 - Funding Information:
Our thanks go to a project in Çukurova Unviersity, Turkey of the Impact of Climate Changes on Agricultural Production System in Arid Areas (ICCAP) in the Research Institute for Humanity and Nature, Japan, and CSIRO, Western Australia for the substantial support of, and contributions to, our research. We would like to thank Dr. Neil C. Turner, University of Western Australia for his comments and suggestions to our manuscript. We thank JSPS for their financial support of the project in Australia and Japan.
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/1
Y1 - 2018/1
N2 - Wheat (Triticum aestivum L.) and rice (Oryza sativa L.), which belong to the Poaceae family, are starch-grain crops, but wheat is adapted to cooler temperature conditions than rice. In this study, the difference between the two contrasting crops in grain-filling adaptability in response to temperature was investigated. Two spring wheat cultivars were grown in the Mediterranean-type environments of Western Australia and Southeast Turkey, and four temperate-zone rice cultivars were grown in several locations in Japan under irrigated conditions. Portions of the crops were enclosed under a plastic canopy to elevate the temperature after anthesis. Average temperatures during grain filling ranged from 14 to 24 °C for wheat and from 23 to 29 °C for rice. Grain yield varied from 280 to 599 g m−2 in wheat and 354 to 736 g m−2 in rice. When plant density was halved at flowering to estimate the potential grain-filling rate under an increased supply of assimilates, the grain-filling percentages [%F, observed grain weight (G)/potential grain weight (PG)] of both crops were represented by similar logistic curves of cumulative temperatures during the grain filling period. These results suggest that grain-filling responses to temperature scarcely differ between spring wheat and temperate-zone rice. G was estimated for the spring wheat and temperate-zone rice cultivars under different temperatures after anthesis using an assimilate-limited grain-potentiality model consisting of the following parameters: rate of whole-plant weight increase (ΔW/Δt), rate of potential grain dry weight increase (ΔPG/Δt) based on rate of%F (%F/Δt) and PG, and the amount of stem reserves (SP). The observed data showed that the decrease in ΔW/Δt with an increase in temperature in wheat was greater than in rice. According to the model, G started to decrease at lower temperatures in wheat than in rice, and this decrease was accelerated by lower amounts of SP. Therefore, the difference in the optimal temperatures for G during grain filling between the two crops was suggested to mainly result from the sensitivity of assimilation to high temperatures.
AB - Wheat (Triticum aestivum L.) and rice (Oryza sativa L.), which belong to the Poaceae family, are starch-grain crops, but wheat is adapted to cooler temperature conditions than rice. In this study, the difference between the two contrasting crops in grain-filling adaptability in response to temperature was investigated. Two spring wheat cultivars were grown in the Mediterranean-type environments of Western Australia and Southeast Turkey, and four temperate-zone rice cultivars were grown in several locations in Japan under irrigated conditions. Portions of the crops were enclosed under a plastic canopy to elevate the temperature after anthesis. Average temperatures during grain filling ranged from 14 to 24 °C for wheat and from 23 to 29 °C for rice. Grain yield varied from 280 to 599 g m−2 in wheat and 354 to 736 g m−2 in rice. When plant density was halved at flowering to estimate the potential grain-filling rate under an increased supply of assimilates, the grain-filling percentages [%F, observed grain weight (G)/potential grain weight (PG)] of both crops were represented by similar logistic curves of cumulative temperatures during the grain filling period. These results suggest that grain-filling responses to temperature scarcely differ between spring wheat and temperate-zone rice. G was estimated for the spring wheat and temperate-zone rice cultivars under different temperatures after anthesis using an assimilate-limited grain-potentiality model consisting of the following parameters: rate of whole-plant weight increase (ΔW/Δt), rate of potential grain dry weight increase (ΔPG/Δt) based on rate of%F (%F/Δt) and PG, and the amount of stem reserves (SP). The observed data showed that the decrease in ΔW/Δt with an increase in temperature in wheat was greater than in rice. According to the model, G started to decrease at lower temperatures in wheat than in rice, and this decrease was accelerated by lower amounts of SP. Therefore, the difference in the optimal temperatures for G during grain filling between the two crops was suggested to mainly result from the sensitivity of assimilation to high temperatures.
KW - Assimilate
KW - Grain yield
KW - High temperature
KW - Optimal temperature
KW - Rice
KW - Wheat
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U2 - 10.1016/j.fcr.2017.10.017
DO - 10.1016/j.fcr.2017.10.017
M3 - Article
AN - SCOPUS:85033660975
SN - 0378-4290
VL - 215
SP - 187
EP - 199
JO - Field Crops Research
JF - Field Crops Research
ER -