Nitrate Transport Rate in the Xylem of Tomato Plants Grafted onto a Vigorous Rootstock
| Autor: | Francisco Albornoz, Jorge Leigh Urbina, Ursula Steinfort, Matías Monasterio, Miguel Gómez, Alonso G. Pérez-Donoso |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine chemistry.chemical_element stem hydraulic conductance 01 natural sciences solanum lycopersicum × solanum habrochaites xylem vessel density lcsh:Agriculture 03 medical and health sciences chemistry.chemical_compound Nitrate vessel diameter Growth rate fungi Solanum lycopersicum × Solanum habrochaites lcsh:S Xylem food and beverages Grafting Nitrogen Vessel diameter Horticulture 030104 developmental biology chemistry Nitrate transport Rootstock Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | Agronomy, Vol 10, Iss 2, p 182 (2020) Agronomy Volume 10 Issue 2 |
| ISSN: | 2073-4395 |
| Popis: | Vigorous interspecific rootstocks increase nitrogen (N) uptake in tomato plants but limited information is available on xylem transport rate. Non-grafted and self-grafted tomato plants cv. Attiya and plants grafted onto an interspecific hybrid, Kaiser, were grown under growth chamber conditions and subjected to two light levels, 400 or 800 µ mol PAR m&minus 2 s&minus 1. Plant water uptake, xylem sap NO3- content, and stem hydraulic conductance (ks) were measured after two weeks of growth. Xylem vessel number and diameter were evaluated in cross-sectional stem cuts and the theoretical xylem hydraulic conductance (kh) was calculated. Only the light level modified the xylem NO3&ndash content. Grafting reduced ks by 84% in comparison to non-grafted plants. The water uptake rate and xylem sap NO3&minus content were 4.02 ± 0.66 g H2O kg&minus 1 DW h&minus 1 and 12.78 ± 1.16 mM, respectively, across all grafting treatments. The rootstock has a higher kh because the vessel diameter is 79.3 ± 14.4 µ m while in non-grafted plants it is 62.0 ± 10.1 µ m. Nitrate concentration and transport rate changes accordingly to the plant&rsquo s growth rate. The vigorous rootstock relies on larger vessels to supply the required amounts of N. |
| Databáze: | OpenAIRE |
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