Periodical
Phosphate response of Trifolium uniflorumcompared with T. repensand some T. repens×T. uniflorumhybrids
| العنوان: | Phosphate response of Trifolium uniflorumcompared with T. repensand some T. repens×T. uniflorumhybrids |
|---|---|
| المؤلفون: | Nichols, S. N., Crush, J. R. |
| المصدر: | Crop and Pasture Science; 2015, Vol. 66 Issue: 8 p857-863, 7p |
| مستخلص: | Introgression of genes from Trifolium uniflorum L. into T. repens L. (white clover) is being investigated as a method to improve phosphorus (P) use efficiency in white clover; however, little is known about the edaphic adaptations or P physiology of T. uniflorum. Growth responses to added P of T. uniflorum, T. repens and some T. repens×T. uniflorum hybrids were determined in a glasshouse experiment in pots of soil. Trifolium uniflorum showed traits consistent with adaptation to low-P soils: slow growth rate, small leaves, relatively high leaf-tissue P concentrations, and sequestration of P in its roots when soil P levels were increased. The response of Kopu II, one of the hybrid backcross parents, was quite different; it showed high growth rate, large leaves, much lower leaf P concentrations, and a large decrease in root:shoot P allocation as soil P increased. Tahora, the other backcross parent, exhibited several characteristics that were intermediate between Kopu II and T. uniflorum, probably reflecting its breeding origins from New Zealand hill-country ecotypes. This study confirms the potential for interspecific hybridisation with T. uniflorum to increase the tolerance of white clover to low soil P levels, through incorporation of traits related to edaphic adaptations. Variation among the hybrid families in their response to changing soil P confirmed previously published conclusions about the need to screen widely in hybrid material. |
| قاعدة البيانات: | Supplemental Index |
| تدمد: | 18360947 18365795 |
|---|---|
| DOI: | 10.1071/CP14261 |