Crops ›› 2019, Vol. 35 ›› Issue (6): 76-82.doi: 10.16035/j.issn.1001-7283.2019.06.012

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Research on the Root Growth of Different Drought-Resistant Fagopyrum tataricum under Different Water Conditions

Yang Tian1,Zhang Yongqing1,2,Dong Fuhui1,Ma Xingxing2,Xue Xiaojiao1   

  1. 1School of Life Science, Shanxi Normal University, Linfen 041004, Shanxi, China
    2College of Geographical Sciences, Shanxi Normal University, Linfen 041004, Shanxi, China
  • Received:2019-04-19 Revised:2019-06-22 Online:2019-12-15 Published:2019-12-11
  • Contact: Yongqing Zhang

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Abstract:

The purpose of this study was to find out the relationship between root morphology and physiology and drought resistance of Fagopyrum tataricum, to provide a theoretical basis for high-yield and high-quality cultivation and management and selection of drought-resistant varieties of Fagopyrum tataricum. The method of artificial water-control was adopted. Quantitative indices of root growth for different drought-resistant Fagopyrum tataricum varieties (Diqing tartary buckwheat and Heifeng 1) under normal water supply and severe drought were determined and analyzed, during which the change of root growth of Fagopyrum tataricum was simulated. Results showed that, root-shoot ratio, the contents of malonaldehyde (MDA) and proline (Pro) increase significantly under the drought stress condition, while maximum root length, root volume and root surface area showed adecreasing significantly. Under different water conditions, the root-shoot ratio of Fagopyrum tataricum decreased, the maximum root length, root volume and root surface area increased, MDA content increased, and Pro content increased first and then decreased with the development of growth period. The results of variances analysis showed that under severe drought stress, root-shoot ratio, maximum root length, root volume, root surface area and root Pro content of Diqing tartary buckwheat were significantly higher than Heifeng 1, and MDA content was significantly lower than Heifeng 1. By establishing regression analysis equation, it can be concluded that the mathematical models of root surface area and maximum root length treated with different treatments were the same during the whole growth period, and they all conformed to the exponential model, while the indexes of root volume and MDA content conformed to the unitary quadratic equation. Under drought stress, the growth of the roots and aerial parts of Tartary buckwheat was inhibited, and the effects on the shoots were greater than those of the roots. Compared with Heifeng 1, Diqing tartary buckwheat has stronger drought tolerance.

Key words: Drought stress, Tartary buckwheat, Root morphology, Physiological index, Mathematical model

Fig.1

Changes of root surface area of different treatments Different lowercase letters indicate significant difference at 5% level of probability for the same variety in different treatments during the same period. Different capital letters indicate significant difference at 5% level of probability among different varieties in same treatments. The same below"

Fig.2

Changes of root volume of different treatments"

Fig.3

Changes of maximum root length of different treatments"

Fig.4

Changes of root-shoot ratio of different treatments"

Table 1

Effects of different water conditions on MDA content of different tartary buckwheat varieties nmol/gFM"

取样日期(月/日)
Sampling date
(Month/day)		 迪庆苦荞Diqing tartary buckwheat 黑丰1号Heifeng 1
正常供水
Normal water supply		 重度干旱胁迫
Severe drought stress		 正常供水
Normal water supply		 重度干旱胁迫
Severe drought stress
6/4 6.20±0.95Bb 7.54±0.12Ba 6.81±0.45Ab 9.12±1.59Aa
6/14 7.18±0.29Bb 8.12±0.10Ba 7.55±0.30Ab 9.59±0.07Aa
6/24 7.98±0.39Bb 9.81±0.21Ba 8.16±0.23Ab 11.32±0.50Aa
7/4 8.44±0.91Bb 12.66±0.20Ba 9.71±0.15Ab 15.40±0.79Aa
7/14 9.57±0.42Bb 14.54±0.37Ba 10.50±0.31Ab 18.65±0.58Aa
7/24 11.53±0.50Bb 15.70±0.44Ba 13.76±0.18Ab 21.11±0.94Aa
8/4 12.85±0.72Bb 16.59±0.14Ba 14.88±0.28Ab 22.07±0.68Aa
8/14 13.78±0.53Bb 17.27±0.29Ba 15.59±0.53Ab 22.67±0.76Aa

Table 2

Effects of different water conditions on Pro content of different tartary buckwheat varieties μg/gFM"

取样日期(月/日)
Sampling date
(Month/day)		 迪庆苦荞Diqing tartary buckwheat 黑丰1号Heifeng 1
正常供水
Normal water supply		 重度干旱胁迫
Severe drought stress		 正常供水
Normal water supply		 重度干旱胁迫
Severe drought stress
6/4 23.26±0.39Ab 26.39±0.96Aa 23.53±1.01Ab 25.33±0.93Ba
6/14 26.36±0.49Ab 28.78±1.56Aa 25.03±0.84Bb 27.47±1.09Ba
6/24 28.70±0.40Ab 37.25±1.07Aa 27.14±0.92Bb 29.89±0.97Ba
7/4 31.82±0.59Ab 48.83±1.25Aa 29.71±1.21Bb 37.33±1.26Ba
7/14 36.24±0.67Ab 58.77±0.98Aa 32.49±0.98Bb 46.01±0.99Ba
7/24 39.91±0.58Ab 60.99±1.12Aa 30.60±1.32Bb 43.72±1.90Ba
8/4 36.48±0.99Ab 54.30±0.97Aa 27.53±1.01Bb 38.02±1.24Ba
8/14 33.49±1.01Ab 49.80±0.89Aa 26.30±1.22Bb 37.79±0.91Ba
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