Genetic loci associated with response to abiotic stress
Compositions and methods useful in identifying and counter-selecting maize plants with having enhanced yield-related traits relative to control plants under abiotic stress conditions such as salt stress and/or drought are provided herein. The methods use molecular genetic markers to identify, select and/or construct salt stress tolerant and/or drought tolerant maize plants. Also provided are methods to enhance tolerance to salt stress and/or drought in crop plants by transforming crop plants with the Zea mays antiporter/sodium ion transporter or by introducing favorable allelic variants of the Zea mays antiporter/sodium ion transporter gene via gene editing.
1. A method of increasing tolerance to salt stress and/or drought in a plant, comprising: (a) expressing in a plant a heterologous polynucleotide that encodes a polypeptide having an amino acid sequence of at least 95% sequence identity to SEQ ID NO:16; and (b) thereby increasing the tolerance to salt stress and/or drought in the plant when compared to a control plant not comprising the recombinant polynucleotide.
2. The method of claim 1 , further comprising: (c) obtaining a progeny plant derived from the plant expressing the heterologous polynucleotide, wherein said progeny plant comprises in its genome the recombinant polynucleotide and exhibits increased tolerance to salt stress and/or drought when compared to a control plant not comprising the recombinant polynucleotide.
3. The method of claim 1 , wherein said plant is selected from the group consisting of: Arabidopsis , maize, soybean, sunflower, sorghum, canola, wheat, alfalfa, cotton, rice, barley, millet, sugar cane, and switchgrass.
4. The method of claim 1 , wherein said plant is a monocot.
5. The method of claim 4 , wherein said monocot is maize.