Photosynthesis of the rice plant under water stress

Yoshida, Shigemitsu; Shioya, Michi

doi:10.1080/00380768.1976.10432978

Cited by 20 publications

(5 citation statements)

References 25 publications

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“…The CTDs of all the genotypes in clear days were significantly lower than in cloudy days irrespective of season and growth stage ( Table 2). It is a well observed phenomenon that under high solar radiation and drought condition, an increase in air temperature and a decrease in soil moisture increases stomatal resistance; which subsequently increases canopy temperature and decreases CTD (Roberts et al, 2000;Urban et al, 2007;Yoshida and Shioya, 1976). In both seasons, irrespective of sky condition, CTDs decreased with the advancement of stage due to an increase in air temperature and depletion in soil water with seasonal advancement (spring to summer).…”

Section: Discussionmentioning

confidence: 96%

Cooler Canopy Contributes to Higher Yield and Drought Tolerance in New Wheat Cultivars

et al. 2014

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Drought is an important abiotic stress limiting wheat (Triticum aestivum L.) yield in the U.S. Southern High Plains. Although wheat breeding has improved drought tolerance in the area, the physiological traits conferring drought tolerance have not been well understood. Canopy temperature depression (CTD), the difference between air and canopy temperatures, has been suggested as a trait for identifying drought‐tolerant genotypes. The objective of this study was to investigate whether a higher CTD is one of the reasons for higher yield in new drought‐tolerant cultivars. Field experiments were conducted in five genotypes (TAM 111, TAM 112, TX86A5606, TX86A8072, and Dumas) under dryland conditions in 2009/2010, 2010/2011 and 2011/2012 seasons. The canopy temperature was measured continuously from late jointing to the middle of grain filling, using wireless infrared thermometers. Although CTD varied with sky conditions, growth stage, and time of day, the genotypic variation in CTD was consistent. In general, yield was positively correlated to daytime CTD whether the CTD was used from a single clear day or a season‐long mean. However, including Dumas weakened the correlation under severe drought in 2012. The nighttime CTD was not correlated to yield. Two new cultivars (TAM 111 and TAM 112) had up to 2.7°C higher CTD and 31% more yield than other genotypes. Therefore, cooler daytime canopy might be the reason for higher yield in the two new and drought‐tolerant cultivars under drought conditions. Further studies are needed to understand the physiological bases of differences in CTD among genotypes.

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Section: Discussionmentioning

confidence: 96%

Cooler Canopy Contributes to Higher Yield and Drought Tolerance in New Wheat Cultivars

et al. 2014

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“…Relative chlorophyll content was determined in fully expanded flag leaves from three stages of crop development using a SPAD‐502 l meter (Minolta). N concentration was measured by Kjeldahl from dried leaf and root samples (hydroponics) and leaf and mature seed (paddy fields) according to Yoshida and Shioya, . Total N content was calculated as N concentration multiplied by dry weight.…”

Section: Methodsmentioning

confidence: 99%

Development and field performance of nitrogen use efficient rice lines for Africa

Selvaraj

Valencia

Ogawa

et al. 2017

Plant Biotechnology Journal

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SummaryNitrogen (N) fertilizers are a major input cost in rice production, and its excess application leads to major environmental pollution. Development of rice varieties with improved nitrogen use efficiency (NUE) is essential for sustainable agriculture. Here, we report the results of field evaluations of marker‐free transgenic NERICA4 (New Rice for Africa 4) rice lines overexpressing barley alanine amino transferase (HvAlaAT) under the control of a rice stress‐inducible promoter (pOsAnt1). Field evaluations over three growing seasons and two rice growing ecologies (lowland and upland) revealed that grain yield of pOsAnt1:HvAlaAT transgenic events was significantly higher than sibling nulls and wild‐type controls under different N application rates. Our field results clearly demonstrated that this genetic modification can significantly increase the dry biomass and grain yield compared to controls under limited N supply. Increased yield in transgenic events was correlated with increased tiller and panicle number in the field, and evidence of early establishment of a vigorous root system in hydroponic growth. Our results suggest that expression of the HvAlaAT gene can improve NUE in rice without causing undesirable growth phenotypes. The NUE technology described in this article has the potential to significantly reduce the need for N fertilizer and simultaneously improve food security, augment farm economics and mitigate greenhouse gas emissions from the rice ecosystem.

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“…The rate of photosynthesis and the rate of transpiration were similarly affected by water deficits and hence water use efficiency and Ci were about the same under the different soil water conditions. Yoshida and Shioya [17] and Singh and Sasahara [12] also obtained parallel changes in the rate of photosynthesis and the rate of transpiration under different soil water conditions. Thus water use efficiency in rice appears to be independent of soil water conditions, and this contrasts with the negative relationship between leaf ageing and water use efficiency shown earlier in this study.…”

Section: Effects Of Water Deficitsmentioning

confidence: 96%

Leaf gas exchange of upland and lowland rice cultivars

1985

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Leaf gas exchange of upland and lowland rice cultivars were measured during late vegetative and during grain filling stages in the field under upland and lowland growth conditions. The rate of photosynthesis and water use efficiency (the rate of photosynthesis/the rate of transpiration) under upland conditions decreased with ageing, but generally varied little among four cultivars. At mid-grain filling under lowland conditions, upland cultivars showed lower rates of photosynthesis and transpiration than the lowland cultivars with concomitant reduction in whole plant conductance. At this stage, water use efficiency was higher under upland conditions than under lowland conditions, particularly in the upland cultivars. Water stress reduced the rate of photosynthesis without altering water use efficiency.

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Photosynthesis of the rice plant under water stress

Cited by 20 publications

References 25 publications

Cooler Canopy Contributes to Higher Yield and Drought Tolerance in New Wheat Cultivars

Cooler Canopy Contributes to Higher Yield and Drought Tolerance in New Wheat Cultivars

Development and field performance of nitrogen use efficient rice lines for Africa

Leaf gas exchange of upland and lowland rice cultivars

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