Variety traits

Heat Tolerance — Broccoli

Brassica oleracea L. (Broccoli Group)

The ability of a cultivar to maintain inflorescence density and head quality at temperatures above 20–25°C without premature bolting.

In the reference 5 varieties crop Broccoli, where this is mentioned in the description.

For broccoli, heat tolerance is defined as the crop's ability to maintain its marketability and head structure at temperatures above the optimal range of 16–25°C. Particular sensitivity is manifested during increases in nighttime temperatures, which is critical for forming high-quality produce.

High temperatures trigger premature bolting, inflorescence looseness, and a decline in taste quality in sensitive cultivars. Heat-tolerant hybrids maintain head density and marketable yield under stress conditions, whereas less resistant varieties degrade rapidly.

The trait is evaluated using indirect methods via comparative trials of summer cropping cycles based on marketable yield. Scientific research on physiological response includes the analysis of osmoprotectant accumulation, changes in chlorophyll content, and hormonal balance in plant tissues.

General information about the subject — on the page Heat tolerance.

Sources7

Varieties of Broccoli mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.