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DROUGHT STRESS

Effect of Drought Stress on Leaf and Whole Canopy Radiation Use Efficiency and Yield of Maize

^a Dep. of Crop and Soil Sciences, 3111 Miller Plant Sciences Bldg., Univ. of Georgia, Athens, GA 30602-7272 (current address: Dep. of Plant Agric., Univ. of Guelph, Guelph, ON N1G 2W1 Canada)
^b USDA-ARS, Crop Protection and Manage. Res. Unit, Tifton, GA 31793

^* Corresponding author (hjearl{at}uga.edu)

Received for publication June 18, 2002. Drought stress reduces yield of maize (Zea mays L.) and other grain crops by (i) reducing canopy absorption of incident photosynthetically active radiation (PAR), (ii) reducing radiation use efficiency (RUE), and (iii) reducing harvest index (HI). The primary objective of this work was to quantify yield losses attributable to each of these components for maize exposed to drought stress in a 2-yr field study. A second objective was to examine the relationship between RUE at the single leaf level (estimated using chlorophyll fluorescence techniques) and RUE at the whole crop level. Two levels of soil water deficit and a control treatment were established using drip tape irrigation, and dry matter harvests were taken at midseason and at physiological maturity. Mild and severe water stress treatments reduced final grain yield by 63 and 85%, respectively, in 2000, and by 13 and 26%, respectively, in 2001. Reduction of intercepted PAR (IPAR) was generally a very minor yield loss component. Yield losses attributable to reduced RUE and reduced HI were of similar magnitude. Weekly chlorophyll fluorescence measurements were used to estimate the average quantum efficiency of photosystem II at a photosynthetic photon flux density of 1200 µmol m^-2 s^-1 (_II1200) for each plot. Crop dry matter accumulation was not linearly related to IPAR, due to decreased RUE in the water stress treatments. However, the linear relationship was restored when daily IPAR was multiplied by the current estimate of _II1200, suggesting that _II1200 can be used as an indicator of whole-crop RUE.

Abbreviations: APAR, absorbed PAR • DAP, days after planting • _II, quantum efficiency of photosystem II • _II1200, _II at PPFD = 1200 µmol m^-2 s^-1 • HI, harvest index • IPAR, intercepted PAR • PAR, photosynthetically active radiation • PPFD, photosynthetic photon flux density • RUE, radiation use efficiency

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