干旱区生态环境知识资源中心(Arid): 胡杨异胚发育叶片碳平衡研究

Arid

	胡杨异胚发育叶片碳平衡研究
其他题名	A study on the carbon balance of the heteromorphic leave of Populus euphratica
	杨琼; 李熙萌; 李征珍; 石莎; 冯金朝
来源期刊	云南大学学报. 自然科学版
ISSN	0258-7971
出版年	2015
卷号	37 期号:4 页码:607-615
中文摘要	胡杨成熟个体植株上的叶片可大概分为3种叶形,即阔卵圆形(BO) 、过渡形(O)及披针形(L). 叶片尺度的碳平衡取决于光合作用和呼吸作用,但机理尚不明. 作者研究了胡杨异形叶的气体交换、形态学和生化特性. 结果显示: ① 胡杨3种叶形比叶面积(SLA)存在显著差异,阔卵圆形叶比叶面积SLA = (6.69 0.24)m~2·kg~(-1)显著低于其余两者(过渡形叶SLA = (7.36 0.09) m~2·kg~(-1),披针形叶SLA = (8.09 0.16) m~2·kg~(-1)),叶片单位质量氮含量(N_(mass))存在差异但不具显著差异; ② 阔卵圆形叶单位面积碳同化速率(A_(area) =(11.92 1.22) mumol·m~(-2)·s~(-1))显著高于过渡形叶(A_(area) = (10.21 1.43) mumol·m~(-2)·s~(-1))和披针形叶(A_(area) = (9.98 1.04) mumol·m~(-2)·s~(-1)),然而,单位质量(A_(mass))和单位氮碳同化速率(AN)在3种叶形中并不具显著差异,披针形叶的A_(mass) = (80.37 7.07) mumol·kg~(-1)·s~(-1) (DW)和A_N = (80.37 7.07) mumol·kg~(-1)·s~(-1) (DW)略高于其它2种叶形; ③ 阔卵圆形叶单位面积及单位质量暗呼吸速率(R_(n-area) = (1.90 0.17) mumol·m~(-2)·s~(-1)和Rn-mass = (12.58 0.77) mumol·kg~(-1)·s~(-1) (DW))显著高于过渡形叶(R_(n-area) = (1.60 0.19)mumol·m~(-2)·s~(-1)和Rn-mass = (11.85 0.15) mumol·kg~(-1)·s~(-1) (DW))及披针形叶(R_(n-area) = (1.57 0.29) mumol·m~(-2)·s~(-1)和Rn-mass = (11.25 0.92) mumol·kg~(-1)·s~(-1) (DW)),另外,3种叶形叶片光下线粒体呼吸速率(RL)均大于暗呼吸速率,说明光对暗呼吸有抑制作用,且不同叶形抑制程度也不同,从披针叶形50.37% 到阔卵圆形叶的80.67%; ④ 不同叶形叶片水平碳平衡(A_g/R)差异不显著,但披针形叶的A_g/R = 7.90 1.39高于其余2种叶形(阔卵圆形叶A_g/R = 6.19 0.87,过渡形叶A_g/R = 7.65 1.71). 由此推测,阔卵圆形叶片可能具更强结构支持能力和更高呼吸速率,利于个体的生理维持,而披针形叶具更高的碳同化能力则用于支持生长.
英文摘要	Desert poplar(Populus euphratica) is known as a heteroblastic species,with the leaves of mature individuals being roughly classified into three types,namely broad ovate leaf(BO), lanceolate leaf(L) and ovate leaf(O). Previous studies have shown that polymorphic leaves of Populus euphratica differs in their anatomical and physiological properties. The leaf level carbon balance which is determined by both photosynthesis and respiration, however, remains is unclear. Gas exchange characteristics,morphological and biochemical traits of polymorphic leaves of Populus euphratica were studied. Our results showed: (a) Specific leaf area differed(SLA) among polymorphic leaves,with the SLA being significantly higher for ovate leaf (SLA = (7.36 0.09) m~2·kg~(-1)) and lanceolate leaf(SLA = (8.09 0.16) m~2·kg~(-1)) than for broad ovate leaf(SLA = (6.69 0.24) m~2·kg~(-1)). Leaf nitrogen content marginally varied among leaves of different shapes but was not statistically significant;(b) Area-based leaf carbon assimilation rate(A_(area)) of broad ovate leaf(A_(area) = (11.92 1.22) mumol·m~(-2)·s~(-1)) was significantly higher than that of ovate leaf(A_(area) = (10.21 1.43) mumol·m~(-2)·s~(-1)) and lanceolate leaf(A_(area) = (9.98 1.04) mumol·m~(-2)·s~(-1)). However,mass-based(A_(mass)) and nitrogen-based carbon assimilation rate(A_N) did not differ among polymorphic leaves,with the A_(mass) and A_N even being slightly higher for lanceolate leaf(A_(mass) = (80.37 7.07) mumol·kg~(-1)·DW·s~(-1) and A_N = (80.37 7.07) mumol·kg~(-1)·DW·s~(-1)) than for other leaf types; (c) Broad ovate leaf showed a significantly greater dark respiration rate on both area and mass basis(R_(n-area) = (1.90 0.17) mumol·m~(-2)·s~(-1) and Rn-mass = (12.58 0.77) mumol·kg~(-1)·DW·s~(-1)) than that of ovate leaf(R_(n-area) = (1.60 0.19) mumol·m~(-2)·s~(-1) and Rn-mass = (11.85 0.15) mumol·kg~(-1)·DW·s~(-1)) and lanceolate leaf(R_(n-area) = (1.57 0.29) mumol·m~(-2)·s~(-1) and Rn-mass = (11.25 0.92) mumol·kg~(-1)·DW·s~(-1)). Furthermore,mitochondrial respiration taking place under daylight(RL) was consistently lower than Rn, reflecting the occurrence of light inhibition of dark respiration. Moreover, the inhibitory effect of light on dark respiration varied among leaf types, spanning from 50.37% in lanceolate leaf to 80.67% in broad ovate leaf; (d) Leaf level carbon balance(A_g/R) did not differe among leaf types,with A_g/R ratio being higher for lanceolate leaf(A_g/R = 7.90 1.39) than for broad ovate leaf(A_g/R = 6.19 0.87) and ovate leaf(A_g/R = 7.65 1.71). Additionally,A_g/Rn was invariably lower than A_g/RL due to the inhibitory effect of light on dark respiration. It is concluded that broad ovate leaves with high physical rigidity and respiration rate may be of importance for individual maintenance,while lanceolate leaves with high carbon gain ability are predominant in supporting growth.
中文关键词	异胚发育 ; 碳平衡 ; 光合作用 ; 呼吸作用 ; 胡杨
英文关键词	heteroblastic development carbon balance photosynthesis respiration Populus euphratica
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ECOLOGY
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:5471117
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233598
作者单位	中央民族大学生命与环境科学学院, 北京 100081, 中国
推荐引用方式 GB/T 7714	杨琼,李熙萌,李征珍,等. 胡杨异胚发育叶片碳平衡研究[J],2015,37(4):607-615.
APA	杨琼,李熙萌,李征珍,石莎,&冯金朝.(2015).胡杨异胚发育叶片碳平衡研究.云南大学学报. 自然科学版,37(4),607-615.
MLA	杨琼,et al."胡杨异胚发育叶片碳平衡研究".云南大学学报. 自然科学版 37.4(2015):607-615.