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Saturated humidity accelerates lateral root development in rice (Oryza sativa L.) seedlings by increasing phloem-based auxin transport.
J Exp Bot. 2007; 58(7):1695-704.JE

Abstract

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.

Authors+Show Affiliations

Chhun T
Center for Supports to Research and Education Activities Isotope Division, Kobe University, Kobe, 657-8501 Japan.
Uno Y
No affiliation info available
Taketa S
No affiliation info available
Azuma T
No affiliation info available
Ichii M
No affiliation info available
Okamoto T
No affiliation info available
Tsurumi S
No affiliation info available

MeSH

Biological TransportHumidityIndoleacetic AcidsOryzaPhloemPhthalimidesPlant Growth RegulatorsPlant LeavesPlant ProteinsPlant RootsRNA, MessengerSeedlingsSequence Analysis, DNASequence Analysis, Protein

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17383991

Citation

Chhun, Tory, et al. "Saturated Humidity Accelerates Lateral Root Development in Rice (Oryza Sativa L.) Seedlings By Increasing Phloem-based Auxin Transport." Journal of Experimental Botany, vol. 58, no. 7, 2007, pp. 1695-704.
Chhun T, Uno Y, Taketa S, et al. Saturated humidity accelerates lateral root development in rice (Oryza sativa L.) seedlings by increasing phloem-based auxin transport. J Exp Bot. 2007;58(7):1695-704.
Chhun, T., Uno, Y., Taketa, S., Azuma, T., Ichii, M., Okamoto, T., & Tsurumi, S. (2007). Saturated humidity accelerates lateral root development in rice (Oryza sativa L.) seedlings by increasing phloem-based auxin transport. Journal of Experimental Botany, 58(7), 1695-704.
Chhun T, et al. Saturated Humidity Accelerates Lateral Root Development in Rice (Oryza Sativa L.) Seedlings By Increasing Phloem-based Auxin Transport. J Exp Bot. 2007;58(7):1695-704. PubMed PMID: 17383991.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Saturated humidity accelerates lateral root development in rice (Oryza sativa L.) seedlings by increasing phloem-based auxin transport. AU - Chhun,Tory, AU - Uno,Yuichi, AU - Taketa,Shin, AU - Azuma,Tetsushi, AU - Ichii,Masahiko, AU - Okamoto,Takashi, AU - Tsurumi,Seiji, Y1 - 2007/03/23/ PY - 2007/3/27/pubmed PY - 2007/8/1/medline PY - 2007/3/27/entrez SP - 1695 EP - 704 JF - Journal of experimental botany JO - J Exp Bot VL - 58 IS - 7 N2 - 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. SN - 0022-0957 UR - https://www.unboundmedicine.com/medline/citation/17383991/Saturated_humidity_accelerates_lateral_root_development_in_rice__Oryza_sativa_L___seedlings_by_increasing_phloem_based_auxin_transport_ DB - PRIME DP - Unbound Medicine ER -