Physicochemical properties and development of wheat large and small starch granules during endosperm development
Physicochemical properties and development of wheat large and small starch granules during endosperm development
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DOI：
10.1007/s11738-010-0478-x
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发表时间：
2010-09-01
影响因子：
2.6
通讯作者：
Chen, Jianmin
中科院分区：
文献类型：
--
作者：
Wei, Cunxu;Zhang, Jun;Chen, Jianmin
小麦成熟种子具有大的透镜状A型淀粉粒和小的球形B型和不规则的C型淀粉粒。在胚乳发育过程中，开花后4 ~ 12天，大的造粉体由原质体分裂而来，并通过二次分裂而增加。大淀粉体中形成并发育大淀粉粒。一个大的淀粉体只有一个大的淀粉粒。小造粉体来源于大造粉体被膜的突起，12 ℃后通过被膜突起分裂并增多。B型淀粉粒在12 ~ 18 ℃时在小淀粉体中形成和发育，C型淀粉粒在18 ℃时在小淀粉体中形成和发育。在一个小的淀粉体中，可以形成和发育许多B型和C型淀粉粒。当淀粉体充满淀粉粒时，淀粉体被膜不同步降解，淀粉粒释放到细胞基质中。大淀粉粒的表观直链淀粉含量高于小淀粉粒，且随胚乳发育而增加。大颗粒淀粉的膨胀力和结晶度低于小颗粒淀粉，且随胚乳发育而降低。小淀粉颗粒显示更广泛的糊化温度范围比大淀粉颗粒。
Wheat mature seeds have large, lenticular A-type starch granules, and small, spherical B-type and irregular C-type starch granules. During endosperm development, large amyloplasts came from proplastid, divided and increased in number through binary fission from 4 to 12 days after flowering (DAF). Large starch granules formed and developed in the large amyloplast. One large amyloplast had only one large starch granule. Small amyloplasts came from the protrusion of large amyloplast envelope, divided and increased in number through envelope protrusion after 12 DAF. B-type starch granules formed and developed in small amyloplast from 12 to 18 DAF, C-type starch granules formed and developed in small amyloplast after 18 DAF. Many B-and C-type starch granules might form and develop in one small amyloplast. The amyloplast envelopes were asynchronously degraded and starch granules released into cell matrix when amyloplasts were full of starch granules. Apparent amylose contents of large starch granules were higher than that of small starch granules, and increased with endosperm development. The swelling powers and crystallinity of large starch granule were lower than that of small starch granules, and decreased with endosperm development. Small starch granules displayed broader gelatinization temperature ranges than did large starch granules.