Millerd A, McWilliam J R
Division of Plant Industry, CSIRO, Canberra, A.C.T., Australia.
Plant Physiol. 1968 Dec;43(12):1967-72. doi: 10.1104/pp.43.12.1967.
A mutant inbred line of Zea mays L. (M11) in which chlorophyll accumulation is particularly sensitive to low temperature is described. Under natural light conditions the chlorophyll content of seedlings is negligible below 17 degrees but is normal at high temperature. Seedlings of M11 can synthesize chloroplast pigments at 16 degrees but at a rate slower than normal. When photo-oxidation is minimized, chlorophyll accumulates, and seedlings can photosynthesize efficiently at low temperature. The primary site of low temperature sensitivity in M11 is the shoot apex where new leaves are developing and undergoing rapid cell expansion. It seems that there is impaired development and associated impaired function of chloroplasts in M11 grown at low temperatures which sensitizes them to rapid photo-oxidation in the light.
描述了一种玉米(Zea mays L.)的突变自交系(M11),其中叶绿素积累对低温特别敏感。在自然光条件下,低于17摄氏度时幼苗的叶绿素含量可忽略不计,但在高温下则正常。M11幼苗在16摄氏度时能够合成叶绿体色素,但速度比正常情况慢。当光氧化作用降至最低时,叶绿素会积累,幼苗能够在低温下高效地进行光合作用。M11中低温敏感性的主要部位是新叶正在发育且细胞快速扩张的茎尖。似乎在低温下生长的M11中叶绿体的发育受损以及相关功能受损,这使其在光照下对快速光氧化敏感。