Crops ›› 2017, Vol. 33 ›› Issue (2): 114-120.doi: 10.16035/j.issn.1001-7283.2017.02.020

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The Responses of the Ecophysiological Characteristics of Amaranthus retroflexus and Glycine max to Seasonal Rainfall Fluctuations

Lu Ping1,Jin Chenggong1,Zhang Xi2,Jiang Baiwen1,Yan Nannan2,Xiao Tongyu1,Bai Yamei1,Li Jingxin2,Chen Rui1,Li Jing1   

  1. 1 School of Resources and Environmental Sciences,Northeast Agricultural University,Harbin 150030,Heilongjiang,China
    2 College of Animal Science and Technology,Northeast Agricultural University,Harbin 150030,Heilongjiang,China
  • Received:2016-10-08 Revised:2017-01-10 Online:2017-04-15 Published:2018-08-26
  • Contact: Baiwen Jiang

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Abstract:

An invasive weed Amaranthus retroflexus and a crop Glycine max were chosen as materials in the greenhouse potted experiment. The specific leaf area (SLA), malondialdehyde (MDA) content, proline content and soluble protein content in leaves of the two species response to the seasonal rainfall fluctuations were studied based on the method of simulating different seasonal rainfall fluctuations. The results showed that both species decreased leaf area to reduce evaporation, while proline and soluble protein contents in leaves of A. retroflexus were higher than those of G. Max under dry and lack of rain conditions, which illustrated that even in the fast growing season under the condition of water shortage, the level of membrane lipid peroxidation of leaves of A. retroflexuswas less than that of G. max, and A. retroflexus could recover quickly. On the seeding stage, the MDA content in leaves of A. retroflexus was higher than that of G. max in mixed cropping, which indicated that A. retroflexus was under severe water stress. But on the flowering stage of G. max, the proline and soluble protein content of A. retroflexus were higher than those of G. max in mixed cropping and the level of membrane lipid peroxidation of A. retroflexus was less than that of G. max, which indicated that A. retroflexus was less affected by water stress than G. max. Therefore, A. retroflexus can adjust morphological character and physiological substance contents to adapt different seasonal rainfall fluctuations in the process of invading agro-ecosystem. It may be one of the important reasons of A. retroflexus can widely distributed in farmland.

Key words: Amaranthus retroflexus, Glycine max, Seasonal rainfall fluctuation, Ecophysiological characteristics

Fig.1

The distribution of simulative rainfall amount in the four seasonal precipitation patterns Central peak, the precipitation peak appeared in the central period of the growing season; Double peak, the precipitation peak appeared in the early and later periods of the growing season; Early peak, the precipitation peak appeared in the early period of the growing season; Late peak, the precipitation peak appeared in the late period of the growing season."

Fig.2

Specific leaf area (SLA) of A. retroflexus and G. max in pure culture (pure) or mixture (mix) in the different growing periods The data in the figure are the mean ±SE of 4 times; different capital letters indicate the significant of the same date but different rainfall pattern; different small letters indicate the significant of the same rainfall pattern but different date (P<0.05), the same below"

Fig.3

Leaf malondialdehyde (MDA) content of A. retroflexus and G. max in pure culture (pure) or mixture (mix) in the different growing periods"

Fig.4

Leaf proline content of A. retroflexus and G. max in pure culture (pure) or mixture (mix) in the different growing periods"

Fig.5

Leaf soluble protein content of A. retroflexus and G. max in pure culture (pure) or mixture (mix) in the different growing periods"

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[1] Xiang Bai,Li Ta,Meiwei Zhao,Chuancai Liu,Guoyin Wei,Lituo Cui,Guangjuan Zeng,Jin Qin. New Research Progress on Alien Invasive Plant Amaranthus retroflexus L. from 2010 to 2015 [J]. Crops, 2016, 32(4): 7-14.
[2] Xi Zhang,Chenggong Jin,Jingxin Li,Ping Lu,Baiwen Jiang,Yamei Bai,Tongyu Xiao,Yutong Cui. The Effects of Seasonal Precipitation Fluctuation on the Photosynthetic Pigments of Redroot Pigweed (Amaranthus retroflexus) and Soybean (Glycine max) [J]. Crops, 2016, 32(1): 154-161.
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