More Effective Protection Supports Male Better Than Female Siblings over Water Deficit in Artificially Bred Poplar Hybrids

Sexually dimorphic response to stress has been observed in assorted natural dioecious plants. Up now, few studies have focused on the difference of responses between artificially bred siblings. To determine sexual dimorphism sibling poplar trees, we conducted a study comparing water deficit male and female Populus × euramericana This pair hybrids was analyzed terms growth, photosynthesis, membrane injury repair systems, as well gene regulation patterns. The siblings presented distinct deficit, with greater inhibition females’ growth photosynthesis. results also displayed that females, relative electrolyte leakage malonaldehyde content were higher than those males under conditions. On other hand, caused increase both SOD activity POD females. Consistent these physiological differences, expression several stress-related genes, including SOD, GST, bHLH35, PsbX1, regulated differently by stress. Higher moderate-water-deficit-treated females bHLH35 moderate- severe-water-deficit-treated suggest sib is more sensitive, whilst PsbX1 water-deficit-treated testify protect cells better. achieve an integrated view, all variables through use principal component analysis total discrepancy sexes their demonstrated. indicate that, compared sibs, are but deploy weaker protective apparatus deal deficit.