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, 42 (4), 601-620

Changes in Photosynthetic Pigments and Chlorophyll-A Fluorescence Attributes of Sweet-Forage and Grain Sorghum Cultivars Under Salt Stress

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Changes in Photosynthetic Pigments and Chlorophyll-A Fluorescence Attributes of Sweet-Forage and Grain Sorghum Cultivars Under Salt Stress

Parvaneh Sayyad-Amin et al. J Biol Phys.

Abstract

Water shortage leads to a low quality of water, especially saline water in most parts of agricultural regions. This experiment was designed to determine the effects of saline irrigation on sorghum as a moderately salt-tolerant crop. To study salinity effects on photosynthetic pigment attributes including the chlorophyll content and chlorophyll fluorescence, an experiment was performed in a climate-controlled greenhouse at two vegetative and reproductive stages. The experimental design was factorial based on a completely randomized design with five NaCl concentrations (control, 50, 100, 150, and 200 mM), two grain and sweet-forage sorghum cultivars (Kimia and Pegah, respectively) and four replications. According to the experimental data, there were no significant differences between two grain and sweet-forage cultivars. Except for 100 and 150 mM NaCl, salinity significantly decreased the chlorophyll index and pigment contents of the leaf, while it increased the chlorophyll-a fluorescence characteristics. Although salinity reduced photosynthetic pigments and the crop yield, either grain or sweet-forage cultivars could significantly control the effect of salinity between 100 and 150 mM NaCl at both developmental stages, showing the possibility of using saline water in sorghum cultivation up to 150 mM NaCl.

Keywords: Carotenoid; Chlorophyll; Fluorescence; Pigment; Salinity; Sorghum.

Figures

Fig. 1
Fig. 1
Changes of chlorophyll-a (Chl a), chlorophyll-b (Chl b), total chlorophyll (Chl a + b), total carotenoid (Car: xanthophyll + carotene) and total photosynthetic pigments (Chl + Car: total chlorophyll + total carotenoid) vs. salinity according to LSD (0.05) test (means ± SE; n = 4). Since vegetative and reproductive stages behaved similarly, they were pooled together
Fig. 2
Fig. 2
Changes of pigment ratios vs. salinity according to LSD (0.05) test (means ± SE; n = 4). a Chlorophyll a to b (Chl a/b), total chlorophyll to total chlorophyll and carotenoid (Chl/(Chl + Car)) and total carotenoid to total chlorophyll and carotenoid (Car/(Chl + Car)). b Total chlorophyll to total carotenoid (Chl/Car) and chlorophyll index (CI). Since vegetative and reproductive stages behaved similarly, they were pooled together
Fig. 3
Fig. 3
Interactions of salinity and sorghum cultivars on seed yield (a), total dry matter (b), and harvest index (HI) (c) according to LSD (0.05) test (means ± SE; n = 4)
Fig. 4
Fig. 4
Correlation of total absorbed performance index (PIABS, total) with seed yield (a), total dry matter (b), and harvest index (c) of sorghum cultivars under salinity at p ≤ 0.05

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