Increase in auxiliary photoprotective photosynthetic pigments in wheat seedlings induced by Azospirillum brasilense |
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| Authors: | Y Bashan J J Bustillos L A Leyva J-P Hernandez M Bacilio |
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| Institution: | (1) Environmental Microbiology Group, Center for Biological Research of the Northwest (CIBNOR), P.O. Box 128, La Paz, B.C.S., 23000, Mexico |
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| Abstract: | Inoculation of wheat seedlings with the plant growth-promoting bacterium Azospirillum brasilense Cd was immobilized in alginate microbeads and, without applying any stress, significantly increased the quantity of several
photosynthetic pigments, such as chlorophyll a, chlorophyll b, and the auxiliary photoprotective pigments violaxanthin, zeaxanthin, antheroxanthin, lutein, neoxanthin, and β-carotene.
This resulted in greener plants with no apparent visible stress. After monitoring the quantity of photosynthetic pigments
for 4 weeks, we observed that inoculated plants had higher quantities of pigments in shoot and stem. The greatest difference
in the quantity of all pigments between inoculated and noninoculated plants occurred in the first week of growth. Regardless
of treatment, the quantity of pigments in stems was three to four times less than the quantity of these pigments in shoots.
Application of Azospirillum, either as liquid inoculant or as alginate microbeads, did not alter the positive effect of the bacteria on pigment production
or the positive response of the plants towards A. brasilense Cd inoculation. |
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| Keywords: | Antheroxanthin Azospirillum Bacterial inoculants β -carotene Lutein Neoxanthin Plant growth-promoting bacteria PGPR Plant pigments Photosynthesis Violaxanthin Xanthophyll Zeaxanthin |
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