Zeaxanthin concentrations co-segregate with the magnitude of the blue light response of adaxial guard cells and leaf stomatal conductances in an F2 population of pima cotton

Conference · Sat May 01 04:00:00 EDT 1993 · Plant Physiology; (United States)

OSTI ID:6030645

Zhenmin, Lu; Zeiger, E ^[1]

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1. Univ. of California, Los Angeles (United States)

A blue light (BL) response of adaxial (AD) guard cells was investigated in two cotton lines with contrasting rates of stomatal conductances (g). This response is expressed as an enhancement of the red light-induced chlorophyll a fluorescence quenching by BL, and has an action spectrum indicative of a carotenoid photoreceptor. Ad guard cell from the high g, advanced line Pima S-6 have a higher carotenoid content and a larger BL response than those from the low g, primitive cotton, B368. In a growth chamber-grown F2 population of a cross between the two lines (n=30), g of individual plants segregated over a range exceeding the average g of the parental populations. Carotenoid content and the BL response of ad guard cell also segregated. There was a positive, strong correlation (r=0.71) between leaf g and the magnitude of the BL response of ad guard cells, indicating that both parameters are under genetic control, and that the BL response of guard cells contributes to the modulation of g. The concentration of all xanthopylls and [beta]-carotene in the ad guard cells correlated poorly with the BL response, except for zeaxanthin (r=0.71). In all green systems, xanthophylls are located inside the chloroplast which suggests that zeaxanthin functions in these organelle as a blue light photoreceptor for cotton guard cells.

• OSTI ID: 6030645
• Report Number(s): CONF-9307119--
• Conference Information: Journal Name: Plant Physiology; (United States) Journal Volume: 102:1
• Country of Publication: United States
• Language: English

Related Subjects

550200* -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
BIOLOGICAL EFFECTS
CARBOXYLIC ACIDS
CAROTENOIDS
CELL CONSTITUENTS
CHLOROPHYLL
CHLOROPLASTS
CONTROL
COTTON
GENETIC CONTROL
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
LEAVES
OPENINGS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PEST CONTROL
PHOTOSENSITIVITY
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
PROTEINS
SENSITIVITY
SPECTRA
STOMATA
TERPENES
VISIBLE SPECTRA