花の色の強さは,Mybに関連する転写因子によって制御される特殊な細胞の形状に依存する
K Noda1, B J Glover, P Linstead
1Nippon Oil Company Ltd, Yamaguchi, Japan.
Nature
|June 23, 1994
まとめ
新しく特定されたミクスタという遺伝子は,表皮細胞の形状を調節することによって,Antirrhinum majusの花色の強度を制御しています. この遺伝子は,花の色素によって光が吸収される方法に影響を与え,花の全体的な色彩に影響を与えます.
科学分野:
- 植物生物学 植物生物学
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
背景:
- 花の色は,アントシアニンやカロテノイドなどの色素によって決定されます.
- 皮膚表皮細胞の形状は,光吸収と花の色素濃度に影響します.
- 円筒状の細胞の形は,より鮮やかな花の色のために光の吸収を高めると考えられています.
研究 の 目的:
- 表皮細胞の形状と花の色素濃度に影響を与える遺伝子を特定する.
- Antirrhinum majusの花の色付けにおけるミクスタ遺伝子の役割を調査する.
主な方法:
- Antirrhinum majus.のトランポゾンタグ付けによる遺伝子識別
- ミクスタ遺伝子のクローニングとシーケンシング.
- 混合変異体における表皮細胞形態の分析.
主要な成果:
- ミクスタ遺伝子は,花びらに生じる表皮細胞の分化に極めて重要であることが判明した.
- ミクスタミュータントは異常で非状の表皮細胞の形を呈する.
- ミクスタ遺伝子は,細胞の形状の転写的調節に関与するMybに関連するタンパク質をコードする.
結論:
- ミクスタ遺伝子は,表皮細胞の形態学を制御することによって,花の色の強度を決定する上で重要な役割を果たします.
- Mybに関連するタンパク質は,植物細胞の形状と潜在的に色素発現の調節に関与しています.
- ミクスタの機能を理解することで,花の色進化の遺伝的コントロールの洞察が得られます.
関連する概念動画
02:19Morphogenesis
Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.
02:00Photoreceptors and Plant Responses to Light
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
02:32Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
02:23Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
01:30General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
01:25Cell Signaling in Plants
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...