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Tottori University (2009)

Physiological and Ecological Studies of Polymorphic Seeds of Two Halophytes : Suaeda salsa and Atriplex centralasiatica

Li Wei-Qiang

Titre : Physiological and Ecological Studies of Polymorphic Seeds of Two Halophytes : Suaeda salsa and Atriplex centralasiatica

Auteur : Li Wei-Qiang

Université de soutenance : Tottori University

Grade : Doctoral Thesis 2009

Présentation

About 0.95 billion hectares of the world’s soils are saline. Salinity is one of a major environmental factor limiting plant growth and productivity in saline soils of arid and semi-arid regions. There have been some attempts to increase crop yield by enhancing salinity tolerance. However, breeding and selection for higher salinity tolerance has brought only limited successes so far. Recently, some attempts have been made to select potentially from the numerous halophytic species some economic halophytes that can be used for on a large scale production in an economically feasible manner. In the process, the saline soils used would also get amended through halophyte planting.

Suaeda salsa and Atriplex centralasiatica are two important annual herbaceous halophytes belonging to the family Chenopodiaceae and widely distributed in China. These two species have economic potential as a source of oil, food, vegetables and fodder and are useful for vegetation rehabilitation in saline soils. In order to use them as a crop, the first essential step is to know the germination characteristics of the seeds of these species in saline environment, as the seed germination is a critical stage for establishment of halophytic vegetation in saline areas.

Previous studies have shown that S. salsa and A. centralasiatica produce dimorphic/polymorphic seeds (brown seeds and black seeds) on the same plant. However, the physiology and ecology of germination of dimorphic/polymorphic seeds under salinity is not well understand. The objectives of this study are to investigate 1) the ecological aspect namely, how environmental factors (salinity, light, storage, temperature ect.) affect germination of the two halophytes, and 2) the physiology aspect namely, how plant hormones affect seed germination and how endogenous hormones were affected by environmental factors of the dimorphic seeds

Annonce

Résumé

Page publiée le 24 octobre 2016, mise à jour le 19 avril 2020