The effects of low boron on growth, gas exchange, boron concentration and distribution of 'Newhall' navel orange (Citrus sinensis Osb.) plants grafted on two rootstocks
Identifieur interne : 001F20 ( Main/Exploration ); précédent : 001F19; suivant : 001F21The effects of low boron on growth, gas exchange, boron concentration and distribution of 'Newhall' navel orange (Citrus sinensis Osb.) plants grafted on two rootstocks
Auteurs : OU SHENG [République populaire de Chine] ; SHANGWEI SONG [République populaire de Chine] ; SHUANG PENG [République populaire de Chine] ; XIUXIN DENG [République populaire de Chine]Source :
- Scientia horticulturae [ 0304-4238 ] ; 2009.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Déficit, Horticulture.
English descriptors
- KwdEn :
Abstract
The effects of low boron (B) on plant growth, photosynthesis, B concentration and distribution of 'Newhall' orange (Citrus sinensis Osb.) plants grafted on either Trifoliate orange (Poncirus trifoliata (L.) Raf.) or Carrizo citrange [C. sinensis (L.) Osb. x Poncirus trifoliata (L.) Raf.] rootstocks were investigated. One-year-old plants of the two scion-rootstock combinations were grown for 183 days in sand:perlite (1:1, v/v) medium under greenhouse conditions. The plants were irrigated with half-strength Hoagland's nutrient solutions containing four B concentrations (0.01, 0.05, 0.10 and 0.25 mg l-1). The growth of root, stem of scion and leaves was less affected by low B treatments when 'Newhall' scion was grafted on Carrizo citrange than on Trifoliate orange. Thus, the growth of scions under low B conditions was mainly depended on the rootstock used, i.e., Carrizo citrange-grafted plants were more tolerant to low B compared to the plants grafted on Trifoliate orange. Boron concentrations in all plant parts decreased significantly by decreasing the B supply in the nutrient solution. Leaves were the dominant sites of B accumulation and showed the greatest reduction in B concentration compared to the other plant parts, as B concentration in the nutrient solution decreased. Irrespective of the rootstock, B levels in the upper-younger leaves were substantially higher than in basal-older leaves when plants were exposed to low B concentrations (<0.05 mg l-1). suggesting that under such conditions B was preferentially translocated to upper-younger leaves to support their growth. Furthermore, B distribution in different plant parts indicated that there was a restriction in translocation of B from root to scion tissues (stems and leaves of scion) under conditions of limited B availability. In addition, low B treatments decreased leaf photosynthetic rate, stomatal conductance and transpiration rate but increased intercellular CO2 concentration in the leaves of 'Newhall' plants, irrespective of the rootstock used. .
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Le document en format XML
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<term>Citrange</term>
<term>Citroncirus webberi</term>
<term>Citrus sinensis</term>
<term>Concentration distribution</term>
<term>Deficiency</term>
<term>Gas exchange</term>
<term>Grafting</term>
<term>Horticulture</term>
<term>Orange</term>
<term>Poncirus trifoliata</term>
<term>Rootstock</term>
<term>Scion</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Echange gazeux</term>
<term>Distribution concentration</term>
<term>Greffage</term>
<term>Porte greffe</term>
<term>Déficit</term>
<term>Greffon plante</term>
<term>Horticulture</term>
<term>Citrus sinensis</term>
<term>Citroncirus webberi</term>
<term>Poncirus trifoliata</term>
<term>Bore</term>
<term>Orange</term>
<term>Citrange</term>
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<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Déficit</term>
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<front><div type="abstract" xml:lang="en">The effects of low boron (B) on plant growth, photosynthesis, B concentration and distribution of 'Newhall' orange (Citrus sinensis Osb.) plants grafted on either Trifoliate orange (Poncirus trifoliata (L.) Raf.) or Carrizo citrange [C. sinensis (L.) Osb. x Poncirus trifoliata (L.) Raf.] rootstocks were investigated. One-year-old plants of the two scion-rootstock combinations were grown for 183 days in sand:perlite (1:1, v/v) medium under greenhouse conditions. The plants were irrigated with half-strength Hoagland's nutrient solutions containing four B concentrations (0.01, 0.05, 0.10 and 0.25 mg l<sup>-1</sup>
). The growth of root, stem of scion and leaves was less affected by low B treatments when 'Newhall' scion was grafted on Carrizo citrange than on Trifoliate orange. Thus, the growth of scions under low B conditions was mainly depended on the rootstock used, i.e., Carrizo citrange-grafted plants were more tolerant to low B compared to the plants grafted on Trifoliate orange. Boron concentrations in all plant parts decreased significantly by decreasing the B supply in the nutrient solution. Leaves were the dominant sites of B accumulation and showed the greatest reduction in B concentration compared to the other plant parts, as B concentration in the nutrient solution decreased. Irrespective of the rootstock, B levels in the upper-younger leaves were substantially higher than in basal-older leaves when plants were exposed to low B concentrations (<0.05 mg l<sup>-1</sup>
). suggesting that under such conditions B was preferentially translocated to upper-younger leaves to support their growth. Furthermore, B distribution in different plant parts indicated that there was a restriction in translocation of B from root to scion tissues (stems and leaves of scion) under conditions of limited B availability. In addition, low B treatments decreased leaf photosynthetic rate, stomatal conductance and transpiration rate but increased intercellular CO<sub>2</sub>
concentration in the leaves of 'Newhall' plants, irrespective of the rootstock used. .</div>
</front>
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<name sortKey="Shangwei Song" sort="Shangwei Song" uniqKey="Shangwei Song" last="Shangwei Song">SHANGWEI SONG</name>
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