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The ultrastructural observation of root tip cell of cucumber seedlings. (A–D) Seedlings grown in control condition. (E–H) Fifty millimole per liter NaCl treated seedlings. (I–L) Seedlings treated with 50 mmol L−1 NaCl and 25 mg L−1 ALA simultaneously. (M–P) Seedlings sprayed 25 mg L−1 ALA only. CW, cell wall; P, plastid; S, starch; M, mitochondria; V, vacuole; RER, rough surfaced endoplasmic reticulum.
