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| Effect of Low Phosphorus Stress on Endogenous Hormone Levels of Different
Maize Genotypes in Seedling Stage |
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Yaou Shen,
Yongzhong Zhang,
Haijian Lin,
Shibin Gao and Guangtang Pan |
Abstract:
The study was aimed at revealing the effect of low phosphorus
stress on endogenous hormone levels of maize lines and displaying the different
regulars of hormone change under phosphorus starvation between high P-efficient
lines and low P-efficient lines, as well as providing the theoretical foundation
for identifying high P-efficient lines at the seedling stage. In the present
research, two high P-efficient inbred lines of maize 178 and 129, two low P-efficient
ones 9782 and 202, with the F1 generation of 178 and 9782 were conducted to
assay for the dynamic change of endogenous hormones in immature leaves and roots
under low-phosphorus treatment by the method of solution culture, sand culture
and field cultivation. As a result, all of the hormones except ABA were observed
more abundant in the high P-efficient lines and F1 hybrid than the low P-efficient
lines. The contents of zeatin in leaves and roots decreased significantly by
the stress of phosphorus starvation under all of the environments, contrarily
the contents of gibberellic acid (GA3), Indol-3-acetic acid (IAA) and Abscisic
Acid (ABA) increased after suffering the low-P stress. In addition, the change
ranges of GA3 and IAA were greater in high P-efficient lines 178, 129 and the
F1 hybrid than in low P-efficient 9782 line and 202 line, whereas it is the
opposite case for Zeatin (ZT) and Abscisic Acid (ABA) contents. However, no
significant difference of every hormone change was observed between the two
high P-efficient inbred lines as well as the two low P-efficient ones. Which
indicated that the distinction of the hormone sensibilities to phosphorus starvation
were just specifically present among the lines with different P-availability
and can be considered as an important reference basis for identifying phosphorus
efficiency of maize lines. Each of the hormones in the F1 hybrid always displayed
the highest or the lowest values among all the lines, indicating the heterobeltiosis
of F1 generation in response to low starvation. So the method of cross breeding
can be considered to applied to breeding higher P-efficient lines of maize.
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How to cite this article:
Yaou Shen, Yongzhong Zhang, Haijian Lin, Shibin Gao and Guangtang Pan, 2012. Effect of Low Phosphorus Stress on Endogenous Hormone Levels of Different
Maize Genotypes in Seedling Stage. Journal of Biological Sciences, 12: 308-314.
DOI: 10.3923/jbs.2012.308.314
URL: https://scialert.net/abstract/?doi=jbs.2012.308.314
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