Physiological Responses and Heat Tolerance Evaluation of Eight Varieties of <i>Primula vulgaris</i> Under Natural High Temperatures.

As shown in Figure 3 c, at Site 3, during the early stages of heat stress (7 June), the stomatal density of MPB, DRW, DR, and EPY showed an increasing trend, while that of the remaining cultivars exhibited varying degrees of decrease.

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Changes in Stomatal Density As shown in Figure 3 a, at Site 1, during the early stages of high-temperature stress on 7 June, the stomatal density of all cultivars showed a decreasing trend, except for that of DR, which exhibited a slight increase ( Figure S5c ).

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