Abstract
Bi-and trinucleate pollen generally differ in the extent of their mitochondrial development at anther dehiscence and in the rate of their attainment of maximum-phosphorylative capacity during germination in vitro, as judged from experiments with representatives of both groups.
The typically trinucleate pollen of Aster tripolium L. immediately respired at a high rate, maintaining a high energy charge. Mitochondria attained maximum electron-transducing capacity within 2 min of incubation, while tube growth started within 3 min. In contrast, the binucleate pollen of Typha latifolia L. only gradually reached a relatively low rate of respiration, concomitant with a temporary decrease in energy charge, upon immersion in the germination medium. Development of the mitochondrial, electrontransducing system occurred in about 75 min, after which the first pollen tubes emerged. Starting from a poor differentiation, mitochondria became increasingly normal in appearance as germination proceeded.
The binucleate pollen of Nicotiana alata Link et Otto and Tradescantia paludosa Anders. et Woods. showed intermediate characteristics: Nicotiana resembled Typha but mitochondria developed at a higher rate; Tradescantia germinated more rapidly and resembled the trinucleate pollen of Aster.
Inhibitors of mitochondrial or cytoplasmic protein synthesis failed to affect the development of the mitochondrial, respiratory capacities during pollen germination. It is concluded that the duration of the lag period is determined by the level and rate of mitochondrial development and not by the division of the generative cell.
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Abbreviations
- BSA:
-
bovine serum albumine
- CAP:
-
D(-) threo chloramphenicol
- CHI:
-
cycloheximide
- DNP:
-
2-4 dinitrophenol
- EBr:
-
ethidium bromide
- EC:
-
energy charge
- EGTA:
-
ethyleneglycol-bis (2-aminoethyl ether) N, N′-tetra-acetic acid
- EM:
-
electron microscope
- ETC:
-
electron transfer chain
- HEPES:
-
N-2-hydroxyethyl piperazine N′-2-ethane sulfonic acid
- LSD:
-
least significant difference
- PVP:
-
polyvinyl pyrrolidone
- RCR:
-
respiratory control ratio
- RH:
-
relative humidity
- TCA:
-
tricarboxylic acid
- TES:
-
N-tris (hydroxymethyl) methyl-2-aminoethane sulfonic acid
- URCI:
-
uncoupler respiratory control index (Hunter et al. 1976)
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Hoekstra, F.A. Mitochondrial development and activity of binucleate and trinucleate pollen during germination in vitro. Planta 145, 25–36 (1979). https://doi.org/10.1007/BF00379924
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DOI: https://doi.org/10.1007/BF00379924