Journal article
Response of sunflower to boron supply at low root zone temperature
Communications in Soil Science and Plant Analysis, Vol.31(11-14), pp.2379-2392
2000
Abstract
Low root temperature has previously been reported to induce boron (B) deficiency in some species but the mechanism is not entirely clear. Using B‐specific resin to buffer B concentrations in solution, we found that decreasing root zone temperature (RZT) from 27 to 12°C for 6 days depressed sunflower (Helianthus annuus L.) dry matter, root length, root to shoot ratio and B uptake. Boron uptake into the shoots was depressed at 12°C RZT to a greater relative extent than dry matter. Furthermore, B partitioning to young leaves decreased with low RZT, particularly at 12°C RZT. The external B requirement for shoot growth increased with low RZT. Leaf functioning was impaired by low B supply as measured by K+ leakage from the youngest mature leaf blade, whereas it was much less affected by RZT, and there was no effect of RZT on B ‐ adequate plants. By contrast, root function was impaired more by low RZT than low B. Therefore, we predict that higher rates of B application will be required for plant growth when soil temperature is below a critical threshold, which for sunflower was about 17°C. Conversely, practices which increase soil temperature above the threshold may also improve plant B nutrition.
Details
- Title
- Response of sunflower to boron supply at low root zone temperature
- Authors/Creators
- Z. Ye (Author/Creator)R.W. Bell (Author/Creator)B. Dell (Author/Creator)L. Huang (Author/Creator)
- Publication Details
- Communications in Soil Science and Plant Analysis, Vol.31(11-14), pp.2379-2392
- Publisher
- Marcel Dekker Inc.
- Identifiers
- 991005544568807891
- Copyright
- 2000 Marcel Dekker Inc.
- Murdoch Affiliation
- School of Biological Sciences and Biotechnology; School of Environmental Science
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.4 Crop Science
- 3.4.1474 Micronutrient Interactions
- Web Of Science research areas
- Agronomy
- Chemistry, Analytical
- Plant Sciences
- Soil Science
- ESI research areas
- Agricultural Sciences