Journal
PLANT JOURNAL
Volume 81, Issue 3, Pages 367-376Publisher
WILEY
DOI: 10.1111/tpj.12736
Keywords
TOND1; quantitative trait locus; tolerance of nitrogen deficiency; rice; N fertilizer; Oryza sativa
Categories
Funding
- National Natural Science Foundation of China [30725023]
- China National High-tech Research and Development ('863') Program [2012AA10A301]
- Special Fund for Agro-Scientific Research in the Public Interest [201003021]
- State Key Laboratory of Plant Physiology and Biochemistry
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Nitrogen (N), the most important mineral nutrient for plants, is critical to agricultural production systems. N deficiency severely affects rice growth and decreases rice yields. However, excessive use of N fertilizer has caused severe pollution to agricultural and ecological environments. The necessity of breeding of crops that require lower input of N fertilizer has been recognized. Here we identified a major quantitative trait locus on chromosome12, Tolerance Of Nitrogen Deficiency1 (TOND1), that confers tolerance to N deficiency in the indica cultivar Teqing. Sequence verification of 75 indica and 75 japonica cultivars from 18 countries and regions demonstrated that only 27.3% of cultivars (41 indica cultivars) contain TOND1, whereas 72.7% of cultivars, including the remaining 34 indica cultivars and all 75 japonica cultivars, do not harbor the TOND1 allele. Over-expression of TOND1 increased the tolerance to N deficiency in the TOND1-deficient rice cultivars. The identification of TOND1 provides a molecular basis for breeding rice varieties with improved grain yield despite decreased input of N fertilizers.
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