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Differences of Low Potassium Stress on Leaves Microstructure of Two Soybean Varieties with Different Resistance(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2009年03期
Page:
434-438
Research Field:
Publishing date:

Info

Title:
Differences of Low Potassium Stress on Leaves Microstructure of Two Soybean Varieties with Different Resistance
Author(s):
QU Ting-ting; CAO Min-jian; LI Xing-tao; WANG Wei
Agronomy College of Shenyang Agricultural University，Shenyang 110161，Liaoning，China
Keywords:
Soybean; Tolerant to potassium; Leaf microstructure
PACS:
S565.101
DOI:
10.11861/j.issn.1000-9841.2009.03.0434
Abstract:
In former thesis，difference of photosynthetic ability due to low K stress between two kinds of resistant varieties had been reported in soybean，but the change of leaves microstructure and factors led to this difference still unclear.So in this experiment，we selected two soybean varieties(lines)with different resistance as material in order to study the effect of low potassium on microstructure of soybean leaves，so as to probing into tolerant mechanism of different resistant varieties on low potassium stress.The plants were grown in modified 1/2Hoaglands’ solution with 0.5 mmolL-1（low potassium stress）and 3.0 mmolL-1of K.Results showed there was no difference in upper epidermis microstructure between low potassium stress and CK for tolerant variety.For resistant variety，the thickness of upper epidermis greatly increased in low potassium stress，but the length of upper epidermis，density of upper epidermis and the ratio of length of upper epidermis to thickness of upper epidermis decreased significantly.At low potassium level，length of the first line palisade cell in tolerant variety reduced.However，length and width of the first and second line palisade cell，thickness of palisade tissue both increased，but the density of palisade cell decreased.Tolerant variety still keep well-developed midvein mesophyll cell and the density of sponge tissue greatly decreased in low potassium stress.The radio of thickness of palisade tissue to thickness of sponge tissue of resistant variety increased significantly in low K level.Compared with CK，the thickness of lower epidermis of tolerant variety increased，while no differences were found for resistant variety.

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Last Update: 2014-09-25