Soil salinity affects sugarcane (Saccharum officinale L.) production in arid and semiarid climates, severely reducing productivity. This study aimed to identify differentially regulated proteins in two cultivars that differ markedly in tolerance of saline soil. Plants were grown for 30 days and then subjected to treatments of 0 and 160 mM NaCl for 15 days. The tolerant cultivar showed a 3-fold upregulation of lipid metabolising enzymes, GDSL-motif lipases, which are associated with defence to abiotic stress, and which were not upregulated in the sensitive cultivar. Lipoxygenase was 2-fold upregulated in the tolerant cultivar but not in the sensitive cultivar, as were Type III chlorophyll a/b binding proteins. Other differences were that in the sensitive cultivar, the key enzyme of C₄ photosynthesis, phosphoenolpyruvate carboxylase was downregulated, along with other chloroplast enzymes. Na⁺ concentrations had not reached toxic concentrations in either cultivar by this time of exposure to salt, so these changes would be in response to the osmotic effect of the soil salinity, and likely be in common with plants undergoing drought stress.

在干旱和半干旱气候下，土壤盐分会影响甘蔗（Saccharum officinale L.）的生产，从而严重降低生产力。这项研究的目的是鉴定两种盐碱土壤耐受性差异显着的蛋白。使植物生长30天，然后进行0和160mM NaCl处理15天。耐性品种显示脂质代谢酶GDSL-基序脂肪酶上调3倍，这与防御非生物胁迫有关，而在敏感品种中未上调。脂氧合酶在耐性品种中被上调了2倍，而在敏感品种中没有被上调，III型叶绿素a / b结合蛋白也是如此。其他区别是在敏感品种中，C的关键酶₄光合作用，磷酸烯醇丙酮酸羧化酶，与其他叶绿体酶一起被下调。到此时暴露于盐的任何一个品种中，Na ⁺浓度都未达到毒性浓度，因此这些变化将响应土壤盐分的渗透作用，并且可能与遭受干旱胁迫的植物相同。