title: STS-95 space experiment for plant growth and development, and auxin polar transport.
abstract: The principal objective of the space experiment, BRIC-AUX on STS-95, was the integrated analysis of the growth and development of etiolated pea and maize seedlings in space, and the effect of microgravity conditions in space on auxin polar transport in the segments. Microgravity conditions in space strongly affected the growth and development of etiolated pea and maize seedlings. Etiolated pea and maize seedlings were leaned and curved during space flight, respectively. Finally the growth inhibition of these seedlings was also observed. Roots of some pea seedlings grew toward the aerial space of Plant Growth Chamber. Extensibilities of cell walls of the third internode of etiolated pea epicotyls and the top region of etiolated maize coleoptiles which were germinated and grown under microgravity conditions in space were significantly low. Activities of auxin polar transport in the second internode segments of etiolated pea seedlings and coleoptile segments of etiolated maize seedlings were significantly inhibited and extremely promoted, respectively, under microgravity conditions in space. These results strongly suggest that auxin polar transport as well as the growth and development of plants is controlled under gravity on the earth.
authors.affiliation: College of Integrated Arts and Sciences, Osaka Prefecture University, Sakai, Japan. ueda@el.cias.osakafu-u.ac.jp
authors.forename: J
authors.initials: J
authors.lastname: Ueda
authors.forename: K
authors.initials: K
authors.lastname: Miyamoto
authors.forename: T
authors.initials: T
authors.lastname: Yuda
authors.forename: T
authors.initials: T
authors.lastname: Hoshino
authors.forename: K
authors.initials: K
authors.lastname: Sato
authors.forename: S
authors.initials: S
authors.lastname: Fujii
authors.forename: S
authors.initials: S
authors.lastname: Kamigaichi
authors.forename: R
authors.initials: R
authors.lastname: Izumi
authors.forename: N
authors.initials: N
authors.lastname: Ishioka
authors.forename: S
authors.initials: S
authors.lastname: Aizawa
authors.forename: I
authors.initials: I
authors.lastname: Yoshizaki
authors.forename: T
authors.initials: T
authors.lastname: Shimazu
authors.forename: K
authors.initials: K
authors.lastname: Fukui
mesh_terms: D001692:Biological Transport; D002473:Cell Wall / Q000502:physiology; D018548:Cotyledon / Q000166:cytology / Q000254:growth & development / Q000378:metabolism; D007210:Indoleacetic Acids / Q000493:pharmacokinetics*; D018532:Pisum sativum / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism; D010937:Plant Growth Regulators / Q000493:pharmacokinetics*; D018520:Plant Shoots / Q000166:cytology / Q000254:growth & development / Q000378:metabolism; D012399:Rotation; D013026:Space Flight; D014893:Weightlessness; D018474:Weightlessness Simulation; D003313:Zea mays / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism
chemical_list: D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; C030737:indoleacetic acid