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Tytuł pozycji:

Root morphological and physiological characteristics in maize seedlings adapted to low iron stress.

Tytuł:
Root morphological and physiological characteristics in maize seedlings adapted to low iron stress.
Autorzy:
Long W; Rice and Sorghum Institute, National Sorghum Improvement Center Sichuan Branch, Sichuan Academy of Agricultural Sciences, Deyang, China.
Li Q; Chongqing Key Laboratory of Economic Plant Biotechnology, Collaborative Innovation Center of Special Plant Industry in Chongqing, Institute of Special Plants, Chongqing University of Arts and Sciences, Yongchuan, China.
Wan N; Luxian Management Committee of modern agricultural park, Luzhou, China.
Feng D; Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Sichuan Agricultural University, Chengdu, China.
Kong F; Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Sichuan Agricultural University, Chengdu, China.
Zhou Y; Chongqing Key Laboratory of Economic Plant Biotechnology, Collaborative Innovation Center of Special Plant Industry in Chongqing, Institute of Special Plants, Chongqing University of Arts and Sciences, Yongchuan, China.
Yuan J; Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Sichuan Agricultural University, Chengdu, China.
Źródło:
PloS one [PLoS One] 2020 Sep 17; Vol. 15 (9), pp. e0239075. Date of Electronic Publication: 2020 Sep 17 (Print Publication: 2020).
Typ publikacji:
Journal Article; Research Support, Non-U.S. Gov't
Język:
English
Imprint Name(s):
Original Publication: San Francisco, CA : Public Library of Science
MeSH Terms:
Plant Roots/*physiology
Seedlings/*physiology
Zea mays/*physiology
Iron/metabolism ; Photosynthesis ; Plant Roots/anatomy & histology ; Seedlings/anatomy & histology ; Stress, Physiological ; Zea mays/anatomy & histology
References:
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Cell. 2016 Jan 28;164(3):447-59. (PMID: 26777403)
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Substance Nomenclature:
E1UOL152H7 (Iron)
Entry Date(s):
Date Created: 20200917 Date Completed: 20201103 Latest Revision: 20201103
Update Code:
20240104
PubMed Central ID:
PMC7498006
DOI:
10.1371/journal.pone.0239075
PMID:
32941470
Czasopismo naukowe
Iron (Fe) deficiency is a common challenge in crop production. Screening and research of Fe-efficient cultivars could alleviate plant stress and increase crop yields in Fe-deficient soils. In the present study, we conducted two hydroponic culture experiments with a control (100 μmol/L Fe3+-EDTA) and low Fe treatment (10 μmol/L Fe3+-EDTA) to study the morphological and physiological mechanisms of response to low Fe stress in maize hybrids seedlings. In the first experiment, we investigated 32 major maize hybrids in Southwest China. We found that six of them, including Zhenghong 2 (ZH 2), were Fe-efficient. Fifteen other cultivars, such as Chuandan 418 (CD 418), were Fe-inefficient. In the second experiment, we investigated the Fe-efficient ZH 2 and Fe-inefficient CD 418 cultivars and found that low Fe stress resulted in significant decreases in root volume, root length, number of root tips, root surface area, and root dry weight, and increased root to shoot ratio, average root diameter, and Fe-dissolution ability per mass of roots in both maize cultivars. However, the increase in Fe-dissolution ability per mass of roots in ZH 2 was higher than that in CD 418, whereas for the other measurements, the low Fe stress-induced changes in ZH 2 were less pronounced than in CD 418. Therefore, under low Fe stress, the above-mentioned growth factors in ZH 2 were higher by 54.84%, 121.46%, 107.67%, 83.96%, 140.00%, and 18.16%, respectively, than those in CD 418. In addition, leaf area, chlorophyll content, net photosynthetic rate, soluble protein content, and Catalase (CAT) and Peroxidase (POD) activities in ZH 2 were higher by 274.95%, 113.95%, 223.60%, 56.04%, 17.01% and 21.13% than those in CD 418. Therefore, compared with the Fe-inefficient cultivar (CD 418), the Fe-efficient cultivar (ZH 2) had a more developed root system and greater Fe absorption capacity per mass of roots under low iron stress, promoted the efficient absorption of Fe, maintained a higher photosynthetic area and photosynthetic rate, thereby facilitating the accumulation of photosynthetic products. Moreover, higher soluble protein content and activities of CAT and POD permitted high osmotic regulation and scavenging ability, which is an important physiological mechanism for ZH 2 adaptation to low Fe stress.
Competing Interests: The authors have declared that no competing interests exist.

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