Saturated humidity accelerates lateral root development in rice (Oryza sativa L.) seedlings by increasing phloem-based auxin transport.
Auxin transport plays a significant role modifying plant growth and development in response to environmental signals such as light and gravity. However, the effect of humidity on auxin transport is rarely documented. It is shown here that the transport of labelled indole-3-acetic acid (IAA) from the shoot to the root is accelerated in rice (Oryza sativa L. ssp. indica cv. IR8) seedlings grown under saturated humidity (SH-seedlings) compared with plants grown under normal humidity (NH-seedlings). The development of lateral roots in SH-seedlings was greatly enhanced compared with NH-seedlings. Removal of the shoot from SH-seedlings reduced the density of lateral roots, and the application of IAA to the cut stem restored the lateral root density, while the decapitation of NH-seedlings did not alter lateral root development. Phloem-based auxin transport appeared responsible for enhanced lateral root formation in SH-seedlings since (i) the rate of IAA transport from the shoot to the root tip was greater than 3.5 cm h-1 and (ii) naphthylphthalamic acid (NPA)-induced reduction of polar auxin transport in the shoot did not influence the number of lateral roots in SH-seedlings. It is proposed that high humidity conditions accelerate the phloem-based transport of IAA from the leaf to the root, resulting in an increase in the number of lateral roots.
Chhun
Tory
T
Center for Supports to Research and Education Activities Isotope Division, Kobe University, Kobe, 657-8501 Japan.
Uno
Yuichi
Y
Taketa
Shin
S
Azuma
Tetsushi
T
Ichii
Masahiko
M
Okamoto
Takashi
T
Tsurumi
Seiji
S
D001692:Biological Transport / Q000187:drug effects; D006813:Humidity; D007210:Indoleacetic Acids / Q000378:metabolism*; D012275:Oryza / Q000033:anatomy & histology / Q000254:growth & development* / Q000378:metabolism; D052585:Phloem / Q000378:metabolism*; D010797:Phthalimides / Q000494:pharmacology; D010937:Plant Growth Regulators / Q000378:metabolism*; D018515:Plant Leaves / Q000378:metabolism; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D018517:Plant Roots / Q000033:anatomy & histology / Q000254:growth & development / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D036226:Seedlings / Q000033:anatomy & histology / Q000254:growth & development* / Q000378:metabolism; D017422:Sequence Analysis, DNA; D020539:Sequence Analysis, Protein
D007210:Indoleacetic Acids; D010797:Phthalimides; D010937:Plant Growth Regulators; D010940:Plant Proteins; D012333:RNA, Messenger; C002687:alpha-naphthylphthalamic acid; C030737:indoleacetic acid