本章不作为重点，所以只列出了标题。

第六章：植物衰老

6.1 BASIC PLANT BIOLOGY

Plant cells have cell wall, central vacuole, and plastids

Photosynthesis takes place in chloroplast

Plant hormones regulate growth and development

6.2 BIOLOGY OF PLANT SENESCENCE

Mitotic senescence occurs in cells of apical meristem

Postmitotic plant senescence involves programmed and stochastic processes

Leaves of Arabidopsis thaliana are model for plant senescence

Leaf senescence is three-step process

Monosaccharides have important role in leaf senescence

Breakdown of the chloroplast provides nitrogen and minerals for other plant organs

Catabolic by-products may stimulate expression of genes involved in organelle dismantling

Plant membranes degrade during leaf senescence

6.3 INITIATING PLANT SENESCENCE

Light intensity affects initiation of plant senescence

Cytokinins delay senescence

Other plant hormones induce senescence

THE ROAD AHEAD

ESSENTIAL CONCEPTS