Canopy temperature on clear and cloudy days can be used to estimate varietal differences in stomatal conductance in rice

Toshiyuki Takai, Masahiro Yano, Toshio Yamamoto

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

Leaf photosynthetic potential, a major determinant of yield potential in rice, is mostly explained by stomatal conductance (gs) as well as leaf N content (Rubisco protein content). Therefore, the rapid and precise evaluation of gs as well as leaf N content would be a valuable addition to rice breeding programs aimed at improved yield potential. We established a simple method based on infrared thermography to estimate varietal differences in gs. Seven rice varieties were cultivated in two-row plots in 2007, and canopy temperatures in three varieties, including a control variety, Koshihikari, were simultaneously measured to determine canopy temperature difference (CTd) between Koshihikari and the other varieties on clear days. The varieties Takanari, Habataki, and TUAT1-5-6a displayed significantly (P < 0.05) lower leaf temperature and higher gs and leaf photosynthetic rate (Pn) than Koshihikari. CTd was closely correlated with gs and Pn. These results indicate that CTd may be useful as a relative index to estimate varietal differences in gs. A significant CTd was still observed even under cloudy conditions in 2008. Takanari and TUAT1-5-6a had lower leaf temperature than Koshihikari on cloudy days as well as on clear days. Subsequent investigation of photosynthetic light response curves revealed that Takanari and TUAT1-5-6a had higher gs and Pn than Koshihikari under lower irradiance. These results suggest that infrared thermography may be a simple method of evaluating varietal differences in gs through CTd, and that it may be practicable even under cloudy conditions.

Original languageEnglish
Pages (from-to)165-170
Number of pages6
JournalField Crops Research
Volume115
Issue number2
DOIs
Publication statusPublished - Jan 20 2010
Externally publishedYes

Keywords

  • Canopy temperature difference (CTd)
  • Infrared thermography
  • Photosynthesis
  • Rice
  • Stomatal conductance (g)

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

Fingerprint Dive into the research topics of 'Canopy temperature on clear and cloudy days can be used to estimate varietal differences in stomatal conductance in rice'. Together they form a unique fingerprint.

Cite this