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Phosphorus Uptake and Growth of Wild-Type Barley and Its Root-Hairless Mutant Cultured in Buffered-and Non-Buffered-P Solutions
| Content Provider | MDPI |
|---|---|
| Author | Xie, Yucong Rathinasabapathi, Bala Schaffer, Bruce Mylavarapu, Rao Liu, Guodong |
| Copyright Year | 2020 |
| Description | Root hairs play an important role in phosphorus (P) nutrition of plants. To better understand the relationship between root hairs and P acquisition efficiency (PAE) in barley, experiments were conducted with the wild-type barley (cv. ’Pallas’) and its root-hairless mutant (brb). A hydroponic split-root system was used to supply P as Ca3(PO4)2 (tri-calcium phosphate, TCP) to one-half and other nutrients to the other half of the root system. Using TCP as a sole P source can simulate a soil solution with buffered low P concentration in hydroponics to induce prolific root hair growth. Root morphology, plant growth, and P uptake efficiency were measured with 50 mg L−1 TCP supplied to the roots in the split-root system and 0, 35, or 1000 μM NaH2PO4 in a non-split-root hydroponic system. The wild-type plants developed root hairs, but they did not contribute to the significant genotypic differences in the P uptake rate when a soluble P source was supplied in the non-split root system, indicating that root hair formation does not contribute to P uptake in a non-split root solution. On the other hand, when grown in a split-root system with one-half of the roots supplied with TCP, the wild-type showed 1.25-fold greater P uptake than the root hairless mutant. This study provides evidence that root hairs play an essential role in plant P uptake when P bioavailability is limited in the root zone. |
| Starting Page | 1556 |
| e-ISSN | 20734395 |
| DOI | 10.3390/agronomy10101556 |
| Journal | Agronomy |
| Issue Number | 10 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-10-13 |
| Access Restriction | Open |
| Subject Keyword | Agronomy Plant Sciences Soil Science Hordeum Vulgare L. Split-root System P Uptake Root Hair Length and Density Buffered-p Hydroponics |
| Content Type | Text |
| Resource Type | Article |
