Suggest rename "rice grain discoloration trait" (CO_320:0000499)

[cooperl09]

I suggest renaming "rice grain discoloration trait" (CO_320:0000499) to "rice glumes discoloration trait" (CO_320:0000499), to better reflect the meaning of the definition:

"The extent of discoloration of glumes caused by species of Sarocladium, Bipolaris, Alternaria, Gerlachia, Fusarium, Phoma, Curcularia, Trichoconiella, and Pseudomonas. Symptoms: Darkening of glumes of spikelets, brown color to black including rotten glumes. Intensity ranges from sporadic discoloration to discoloration of the whole glume"