Abstract Detail

Anatomy and Morphology

Li, Qing [1], Hu, Hao [1], Mauro-Herrera, Margarita [1], Hodge, John [1], Wood, Chris [1], Doust, Andrew [2].

Light duration, quality, and intensity differentially affect developmental phenotypes in the model C4 grass, Setaria.

Plants use light to both fuel photosynthesis and to signal developmental processes such germination and flowering.  Light duration (photoperiod) is an important and predictable environmental variable for most plants, but the quality and intensity of light varies, especially with regard to shading by other plants.  We have been examining the response of the C4 grass Setaria viridis to variation in duration, intensity, and quality of light, in experiments designed to separate these various facets of the light environment.  We find a strong photoperiodic effect on flowering time but little effect of quality and only a small effect of intensity.  In contrast, quality and intensity of light each have strong and interacting effects on various morphological traits, including height, leaf number and tillering.  We are tracking the development of these phenotypes in near real-time, using a digital imaging system built on Raspberry Pi single-board computers, and have discovered novel phenotypes such as shifts in leaf arrangement that are on the border between physiological and morphological responses.  QTL and gene expression analyses of genotypes that differ in their response to light variation show clear differences due to photoperiod, and analyses of other light variables are underway.

1 - Oklahoma State University, Plant Biology, Ecology, and Evolution, PS 301, Oklahoma State University, Stillwater, OK, 74078, US
2 - Oklahoma State University, Plant Biology, Ecology And Evolution, Physical Sciences Room 301, Stillwater, OK, 74078, United States

light quality
plant architecture

Presentation Type: Oral Paper
Number: 0008
Abstract ID:952
Candidate for Awards:None

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