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Investigate how polypeptide composition and light-harvesting chlorophyll-protein complex assembly correlate with chloroplast membrane ultrastructure across developmental zones of lettuce.

December 1, 1976Proceedings of the National Academy of SciencesOpen Access

Development of the photosynthetic unit in lettuce

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Investigate how polypeptide composition and light-harvesting chlorophyll-protein complex assembly correlate with chloroplast membrane ultrastructure across developmental zones of lettuce.
Isolated chloroplast membranes from outer dark-green leaves and interior pale leaves of romaine lettuce shoots.
Assayed polypeptide composition, chlorophyll a:b ratios, and membrane architecture using freeze-fracture electron microscopy alongside a barley chlorophyll b-deficient mutant.
Chloroplasts from mature outer leaves showed fully assembled light-harvesting chlorophyll-protein complexes, low chlorophyll a:b ratios, and characteristic higher-plant fracture faces.
Interior leaf chloroplasts displayed lower chlorophyll levels, elevated chlorophyll a:b ratios, depleted light-harvesting complexes, and altered fracture face morphology lacking large interior particles.

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Implication

Comparative ultrastructural study reveals chloroplast membrane remodeling across romaine lettuce shoot layers, indicating light-harvesting complex assembly drives structural differentiation.

Cite This Study

Henriques et al. (1976) studied this question.

synapsesocial.com/papers/6a8a7ef6238a34ecf4722e79 https://doi.org/10.1073/pnas.73.12.4560

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Implication

Comparative ultrastructural study reveals chloroplast membrane remodeling across romaine lettuce shoot layers, indicating light-harvesting complex assembly drives structural differentiation.

Development of the photosynthetic unit in lettuce

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Discussion

Implication

Cite This Study

Development of the photosynthetic unit in lettuce

Key Points

Discussion

Implication

Cite This Study

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