Plastids, starch and chlorophyll in <em>Vitis vinifera</em> L. berry during its ontogenesis

Abstract

&lt;p style="text-align: justify;"&gt;Structural and ultrastructural investigations on plastidial ontogenesis in the tissues of &lt;em&gt;Vitis vinifera&lt;/em&gt; berry arc realised in narrow association with starch and chlorophyll dosages from the stage of fruit setting till berry ripeness. During the whole of that period, some chloroplasts, starch and chlorophyll arc noted in grape berry.&lt;/p&gt;&lt;p style="text-align: justify;"&gt;Well developed starch chloroplasts and a great deal of chlorophyll are present in herbaceous stage of berry development. A large starch content perhaps seems to show that berries arc involved in their own glucides synthesis during this stage.&lt;/p&gt;&lt;p style="text-align: justify;"&gt;After that, during ripening stage, chlorophyll content strongly decreases and soluble glucides that accumulate in the berry are essentially derived from leaves.&lt;/p&gt;

Noninvasive Evaluation of the Degree of Ripeness in Grape Berries (Vitis ViniferaL. Cv. Bacchus and Silvaner) by Chlorophyll Fluorescence

“…Because chlorophyll concentrations in grapes decline during ripening ( − ), chlorophyll fluorescence determinations could also be another nondestructive way to examine grape ripening because the intensity of chlorophyll fluorescence emanating from a tissue is almost certainly influenced by the chlorophyll concentration. Chlorophyll fluorescence measurements are not only noninvasive but are simple and rapidly taken, and portable chlorophyll fluorometers for field measurements are now readily available ( , ).…”

Metabolic responses to sulfur dioxide in grapevine (Vitis vinifera L.): photosynthetic tissues and berries

“…If so, this would contrast greatly with foliar assimilation, suggesting major differences in the metabolic activity of the plastids. To date in grape berries, only the ultrastructure of plastids have been presented ( Fougere-Rifot et al, 1995 ), however, a recent study of the bioenergetics of tomato chromoplasts demonstrated significant functional rearrangement of electron transport ( Renato et al, 2014 ), which may suggest that sulfur assimilation is also altered.…”