AUTHOR=Sun Yaqiang , Luo Jiawei , Feng Peien , Yang Fan , Liu Yunxiao , Liang Jiakai , Wang Hanyu , Zou Yangjun , Ma Fengwang , Zhao Tao 

TITLE=MbHY5-MbYSL7
mediates chlorophyll synthesis and iron transport under iron deficiency in Malus baccata

JOURNAL=Frontiers in Plant Science

VOLUME=13

YEAR=2022

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2022.1035233

DOI=10.3389/fpls.2022.1035233

ISSN=1664-462X

ABSTRACT=<p>Iron (Fe) plays an important role in cellular respiration and catalytic reactions of metalloproteins in plants and animals. Plants maintain iron homeostasis through absorption, translocation, storage, and compartmentalization of iron <italic>via</italic> a cooperative regulative network. Here, we showed different physiological characteristics in the leaves and roots of <italic>Malus baccata</italic> under Fe sufficiency and Fe deficiency conditions and propose that <italic>MbHY5</italic> (elongated hypocotyl 5), an important transcription factor for its function in photomorphogenesis, participated in Fe deficiency response in both the leaves and roots of <italic>M. baccata</italic>. The gene co-expression network showed that <italic>MbHY5</italic> was involved in the regulation of chlorophyll synthesis and Fe transport pathway under Fe-limiting conditions. Specifically, we found that Fe deficiency induced the expression of <italic>MbYSL7</italic> in root, which was positively regulated by <italic>MbHY5.</italic> Overexpressing or silencing <italic>MbYSL7</italic> influenced the expression of <italic>MbHY5</italic> in <italic>M. baccata.</italic></p>