CAJ | 학술논문

气孔是植物控制气体交换和调节水分散失的门户.大部分高等植物气孔的分布格局是相邻气孔之间被一至多个表皮细胞所间隔.而在有限分布的几个科属的植物种中发现气孔成簇分布的现象,即由2至多个紧密相邻的气孔器组成相对独立的单元,称为气孔簇(stoma tal cluster).以中国原产的盾叶秋海棠(Begonia peltatifolia Li)为研究对象,探讨了叶表皮气孔簇的发育机制及其分布格局.结果表明:气孔发育初期,气孔拟分生组织的成簇(相邻紧密)排列可能是气孔簇形成的主要机制;气孔副卫细胞恢复分裂形成的卫星拟分生组织也对气孔簇的形成起一定的作用.把气孔簇和单个气孔视为一个气孔单元发现,盾叶秋海棠气孔单元密度(单位面积中气孔单元数)和气孔单元大小(气孔单元所包含气孔数)在叶片上呈有规律的分布:前者由叶片中部向叶尖、叶缘逐圈增多,而后者逐圈减少.对这种分布格局的成因进行了讨论.
기공시식물공제기체교환화조절수분산실적문호.대부분고등식물기공적분포격국시상린기공지간피일지다개표피세포소간격.이재유한분포적궤개과속적식물충중발현기공성족분포적현상,즉유2지다개긴밀상린적기공기조성상대독립적단원,칭위기공족(stoma tal cluster).이중국원산적순협추해당(Begonia peltatifolia Li)위연구대상,탐토료협표피기공족적발육궤제급기분포격국.결과표명:기공발육초기,기공의분생조직적성족(상린긴밀)배렬가능시기공족형성적주요궤제;기공부위세포회복분렬형성적위성의분생조직야대기공족적형성기일정적작용.파기공족화단개기공시위일개기공단원발현,순협추해당기공단원밀도(단위면적중기공단원수)화기공단원대소(기공단원소포함기공수)재협편상정유규률적분포:전자유협편중부향협첨、협연축권증다,이후자축권감소.대저충분포격국적성인진행료토론.
The function of stomata in plants is controlling gas exchange and modul ating water balance. The distribution pattern of stomata in most vascular plants follows a certain regulation with at least one normal epidermal cell between tw o stomata. However, some plants restricted in several genera of vascular plants have stomatal clusters in which more than one stoma is adjacently arranged with no epidermal cells among them. The developmental process of stomatal clusters in plants, especially in non-mutant (wild type) vascular plants, has rarely been documented, and very few studies concerning the distribution pattern of stomata l clusters on leaf epidermis have been carried out. We reported the developmenta l mechanism and distribution pattern of stomatal clusters in Begonia peltatifo lia Li native to China. The results indicated that the clustered arrangement o f meris temoids at the juvenile stage of the leaf development contributed greatly to the pattern of stomatal clusters. Additionally, satellite meristemoids derived from subsidiary cells around the mature stomata also had an impact on the develop ment as well as the pattern of stomatal clusters. Regarding stomatal cluster and singly occurring stoma both as a stomatal unit, we found that the stomatal unit density (i.e., number of stomatal unit per area) increased gradually from the mi ddle part to the edge and the apex of the leaf, while stomatal unit size (i.e., number of stomata per stomatal unit) decreased. The possible reason of this pat tern was discussed.