Comparison of the effects of flooding vs. low-oxygen gas on pea (Pisum sativum L. cv. 'Alaska') primary roots

IF 1 Q3 PLANT SCIENCES
Plant Root Pub Date : 2011-01-01 DOI:10.3117/PLANTROOT.5.31
T. Niki, Mitsuo Takahashi, D. Gladish
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引用次数: 3

Abstract

Flooding reduces soil oxygen necessary for root growth. In some mesophytes low levels of oxygen are mitigated by the formation of aerenchyma or expansion of intercellular spaces. But root immersion in water may have effects on roots in addition to reducing oxygen levels. At temperatures >15°C Pisum sativum primary roots develop cavities in the centers of their vascular cylinders in response to saturated or flooded conditions. In the present study we compared the response of flooded pea roots to their response to hypoxia without flooding by using an innovative system that allows separation of the gas environment of a root system from that of its shoot system. Seedlings were flooded after 4 d growth and compared to seedlings in unflooded medium and to seedlings in the gas-manipulation experiment. At 25°C in slightly moist vermiculite, roots 4 d after planting were exposed to a gas mixture with 10.5% oxygen and shoots to 20.5% oxygen and compared to normoxic controls. Oxygen levels in all containers were monitored, root growth was measured, and frequency and size of vascular cavities were determined for all treatments. Under flooding and low-oxygen gas, root growth was suppressed and vascular cavity frequency was strongly enhanced compared to controls. Significant differences in root growth responses were not seen between these differing hypoxic conditions, but low-oxygen gas caused larger cavities than flooding, which suggests flooding with water may have subtle effects different than simple hypoxia.
水淹与低氧气体对豌豆(Pisum sativum L. cv.)影响的比较“阿拉斯加”)原根
洪水减少了根系生长所必需的土壤氧气。在一些中生植物中,低水平的氧气被通气组织的形成或细胞间隙的扩大所缓解。但根系浸泡在水中除了会降低氧含量外,还会对根系产生影响。在50 ~ 15℃的温度下,为适应饱和或淹水的条件,植物的初生根在维管柱的中心发育出空腔。在本研究中,我们比较了淹水豌豆根系对缺氧的反应,通过使用一种创新的系统,允许根系统的气体环境与其茎系统的气体环境分离。幼苗生长4 d后进行淹水处理,并与未淹水处理的幼苗和气体处理的幼苗进行比较。在25°C的微湿蛭石中,将种植后4 d的根暴露于含10.5%氧气的气体混合物中,将芽暴露于含20.5%氧气的气体混合物中,并与常氧对照进行比较。监测所有容器中的氧气水平,测量根的生长情况,并确定所有处理的维管腔的频率和大小。在淹水和低氧条件下,与对照相比,根系生长受到抑制,维管束空洞频率明显增加。在不同的缺氧条件下,根系生长反应没有显著差异,但低氧气体比淹水造成更大的空洞,这表明水淹可能与简单的缺氧有微妙的不同。
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来源期刊
Plant Root
Plant Root PLANT SCIENCES-
CiteScore
1.50
自引率
0.00%
发文量
2
期刊介绍: Plant Root publishes original papers, either theoretical or experimental, that provide novel insights into plant roots. The Journal’s subjects include, but are not restricted to, anatomy and morphology, cellular and molecular biology, biochemistry, physiology, interactions with soil, mineral nutrients, water, symbionts and pathogens, food culture, together with ecological, genetic and methodological aspects related to plant roots and rhizosphere. Work at any scale, from the molecular to the community level, is welcomed.
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