Du, Q. and Zhao, X.H. and Jiang, C.J. and Wang, X.G. and etl, .
(2017)
Effect of potassium deficiency on root growth and nutrient uptake in Maize (Zea mays L.).
Agricultural Sciences, 8 (11).
pp. 1263-1277.
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Abstract
Potassium (K) is an essential nutrient on the growth and development for
maize (Zea Mays L.). And the developed root morphology and root activity
have great significance to nutrient absorption and play an important role in the
growth and development of plants. To explore the response to K-deficiency on
root growth and nutrient absorption of maize, two inbred lines, 90-21-3 (Tolerance
to K deficiency) and D937 (Sensitive to K deficiency) were carried out
to investigate the root morphology, root activity, nutrient uptake and related
traits. The results showed that K-deficiency inhibited the root growth of
90-21-3 and D937, but increased the ratio of root to shoot (R/S). The total
length, root surface area, the root diameter and root volume of root system of
90-21-3 and D937 were significantly decreased by K deficiency, especially the
fine root (0 - 0.4 mm) in root length and root surface area. In addition, the K
concentration of root in the two lines was significantly decreased, but root activity
was significantly improved, which promoted the absorption of the root
system to Na+. Compared with D937, 90-21-3 was able to distribute more
carbohydrates from shoot to the root system under K deficiency, alleviating
the inhibition of root growth. The fine root system was the main part for absorption
nutrient. The length and surface area of 90-12-3 were no difference,
and significantly decreased by 12.90% and 17.65% in D937 after 5 d of K deficiency.
As well, the root activity of 90-21-3 was significantly increased when
encountered to K deficiency, which promoted the accumulation of Na+ and
Ca2+ and regulated the osmotic stress. Therefore, it could be a responding
mechanism for tolerance crop by maintaining large root system, increasing
root activity and adjusting nutrient absorption to adapt to K deficiency.
| Item Type: |
Article
|
| Uncontrolled Keywords: |
Maize, K Deficiency, Root Morphology, Root Activity, Nutrient Absorption |
| Author Affiliation: |
College of Agronomy, Shenyang Agricultural University, Shenyang, China |
| Subjects: |
Crop Improvement |
| Divisions: |
Maize |
| Depositing User: |
Mr T L Gautham
|
| Date Deposited: |
31 May 2018 10:45 |
| Last Modified: |
31 May 2018 10:45 |
| URI: |
http://eprints.icrisat.ac.in/id/eprint/15455 |
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