*3.2. Stress Determining Physiological Traits*

Physiological traits measure the response of plants to different phenomena taking place internally, such as cell injury and production of certain proteins, such as proline, in response to heat stress. MNH-886 showed less CIY while exposed to high temperatures, with an average value of 65, while MNH-814 was susceptible to extreme temperatures and CIY was higher with a value of 80. CIM-557 showed 64.2, while MNH-886 showed a significant value of 76.6 for proline content in heat stress. MNH-814 was found as the most susceptible among fourteen experimental cultivars and showed a proline content value of 5.3 under stress (Table 4).


**Table 4.** Stress determining physiological traits (Relative Water Content = RWC, water potential = WP, Osmotic Potential = OP, CIY = Cell injury = CIY, proline Contents = PCO).
