共 2 条
Stress tolerant traits and root proliferation of Aspalathus linearis (Burm.f.) R. Dahlgren grown under differing moisture regimes and exposed to drought
被引:2
|作者:
MacAlister, Dunja
[1
]
Muasya, A. Muthama
[1
]
Crespo, Olivier
[2
]
Ogola, John B. O.
[3
]
Maseko, Sipho
[4
]
Valentine, Alex J.
[5
]
Ottosen, Carl-Otto
[6
]
Rosenqvist, Eva
[7
]
Chimphango, Samson B. M.
[1
]
机构:
[1] Univ Cape Town, Dept Biol Sci, Private Bag X3, ZA-7701 Rondebosch, South Africa
[2] Univ Cape Town, Environm & Geog Sci Dept, Climate Syst Anal Grp, ZA-7700 Rondebosch, South Africa
[3] Univ Venda, Dept Plant Prod, Private Bag X5050, ZA-0950 Thohoyandou, South Africa
[4] Tshwane Univ Technol, Dept Crop Sci, Private Bag X680, ZA-0001 Pretoria, South Africa
[5] Univ Stellenbosch, Bot & Zool Dept, Private Bag X1, ZA-7602 Matieland, South Africa
[6] Aarhus Univ, Dept Food Sci, Agrofood Pk 48, DK-8200 Aarhus N, Denmark
[7] Univ Copenhagen, Dept Plant & Environm Sci, Sect Crop Sci, Hoejbakkegaard Alle 9, DK-2630 Taastrup, Denmark
基金:
新加坡国家研究基金会;
关键词:
CARBON-ISOTOPE DISCRIMINATION;
WATER-USE EFFICIENCY;
CLIMATE-CHANGE;
PHYSIOLOGICAL-RESPONSES;
QUERCUS-SUBER;
PHOTOSYNTHESIS;
WILD;
PLANTS;
RICE;
TEA;
D O I:
10.1016/j.sajb.2020.03.003
中图分类号:
Q94 [植物学];
学科分类号:
071001 ;
摘要:
In recent decades climate change has impacted ecosystems negatively globally with Mediterranean systems being particularly vulnerable. Changes in rainfall pattern and amounts have led to increases in flooding and droughts in certain areas of the world. Many important agricultural crops such as Aspalathus linearis (Burm.f.) R. Dahlgren, rooibos tea, rely on the Mediterranean-type seasonality in the Western Cape, South Africa. Aspalathus linearis plants, which occur naturally in the Cedarberg, grow in hot and dry summer conditions and have a root that penetrates the soil down to 2 m, yet no work has looked at the root response to drought under low rainfall environments. The objective of this study was to determine the physiological and morphological response of A. linearis plants grown at two different water regimes to drought. A potted glasshouse experiment was carried out where drought stress (withdrawing watering) was imposed on well-watered and low moisture supplied plants. The low moisture droughted plants exhibited drought tolerant mechanisms which included higher root/shoot ratios as well as thinner roots, both of which are effective for water and nutrient uptake. Overall, plants in the 30% FC treatment recorded lower Pmax, gs and E after three days in the drought conditions while 70% FC plants were only affected after five days. Furthermore, plants grown under low moisture conditions produced 50% lower biomass compared to plants grown under adequate moisture conditions. This implies that low rainfall and the occurrences of dry spells and drought, associated with climate change are likely to reduce the production of A. linearis in the Cederberg area. © 2020 SAAB
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页码:342 / 350
页数:9
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