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Frequency, Size, and Distribution of Stomata in Triticale Leaves

Base, middle, and tip part of the abaxial surface of flag and two succeeding lower leaves of 13 cultivars of triticale (x Triticosecale), wheat (Triticum aestivum L.), and rye (Secale cereale L.) with varying ploidy level were studied for stomatal frequency and size (guard cell length). Significant differences existed among cultivars within species, among leaves within cultivars, and among positions within leaves for both frequency and size. Hexaploid triticale ‘Rosner’ had significantly greater number of stomata/unit area than ‘Blueboy’ (wheat) while ‘Snoopy’ (rye) had significantly less. Stomatal frequency and size were negatively correlated (r = –0.80, significant at the 1% level).

‘6TA 204’ had the lowest number and largest stomata size of 6x triticales. With increasing ploidy level within a species, the number of stomata/unit area decreased and stomata size increased.

Key Words: Wheat • Rye • Ploidy level

Received for publication May 21, 1974.