The Anthurium APRR2-like Gene Promotes Photosynthetic Pigment Accumulation in Response to Salt Stress
2022
Jiang, Li | Fu, Yanxia | Tian, Xingkai | Ma, Yuehua | Chen, Fadi | Wang, Guangdong
Anthurium andraeanum Lind. is an important ornamental flower in which accumulation of photosynthetic pigments affects both growth status and ornamental quality. ARABIDOPSIS PSEUDO RESPONSE REGULATOR2 (APRR2) transcription factor, encoded by APRR2-like gene, is reported to influence the accumulation of photosynthetic pigments in tomato and cucumber. Although several studies have shown a link between photosynthetic pigment accumulation and stress tolerance, the possible role of APRR2-like genes in abiotic stress responses has been unclear. In this study, an APRR2 ortholog, AaAPRR2, was isolated from leaves of ‘dark green’ mutant in A. andraeanum ‘Sonate’. qRT-PCR showed that AaAPRR2 had higher transcript levels in spathe, root and strong leaf than in other tissues. The analysis of conserved structural domains in the 4 predicted APRR2-like protein sequence showed that AaAPRR2 contains conserved REC superfamily and MYB-like DNA domain. Heterologous overexpression of AaAPRR2 in Arabidopsis increased photosynthetic pigment accumulation and the transcript levels of endogenous genes related to photosynthetic pigment synthesis. Salinity stress analysis of 35S::AaAPRR2 and WT lines suggested that AaAPRR2 improved salt stress tolerance in Arabidopsis. These results demonstrate a link between photosynthetic pigment contents and abiotic stress and may be useful for enhancing plant color and improving ornamental value.
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