For F1 hybrid progenies, 4-week-old seedlings were planted
in 2 L plastic pots with compost soil. The plants were planted in
September 2010 in the greenhouse, and grown in the greenhouse
under controlled conditions of 26 ◦C day/6 ◦C night. All plants,
including F1 hybrids and cross parents, were cultivated until June
2011 for assessment of characteristics.