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Lateral roots, in addition to adventitious roots, form a barrier to radial oxygen loss in Zea nicaraguensis and a chromosome segment introgression line in maize
Author(s) -
Pedersen Ole,
Nakayama Yohei,
Yasue Hiroki,
Kurokawa Yusuke,
Takahashi Hirokazu,
Heidi Floytrup Anja,
Omori Fumie,
Mano Yoshiro,
David Colmer Timothy,
Nakazono Mikio
Publication year - 2021
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.16452
Subject(s) - introgression , aerenchyma , suberin , biology , botany , zea mays , waterlogging (archaeology) , poaceae , vascular bundle , agronomy , cell wall , ecology , genetics , gene , wetland
Summary Plants typically respond to waterlogging by producing new adventitious roots with aerenchyma and many wetland plants form a root barrier to radial O 2 loss (ROL), but it was not known if this was also the case for lateral roots. We tested the hypothesis that lateral roots arising from adventitious roots can form a ROL barrier, using root‐sleeving electrodes and O 2 microsensors to assess ROL of Zea nicaraguensis , the maize ( Zea mays ssp. mays ) introgression line with a locus for ROL barrier formation (introgression line (IL) #468) from Z. nicaraguensis and a maize inbred line (Mi29). Lateral roots of Z. nicaraguensis and IL #468 both formed a ROL barrier under stagnant, deoxygenated conditions, whereas Mi29 did not. Lateral roots of Z. nicaraguensis had higher tissue O 2 status than for IL #468 and Mi29. The ROL barrier was visible as suberin in the root hypodermis/exodermis. Modelling showed that laterals roots can grow to a maximum length of 74 mm with a ROL barrier, but only to 33 mm without a barrier. Presence of a ROL barrier in lateral roots requires reconsideration of the role of these roots as sites of O 2 loss, which for some species now appears to be less than hitherto thought.