The WRKY transcription factor HpWRKY44 regulates expression in red pitaya fruit ().

Red pitaya () fruit is a high-value, functional food, containing a high level of betalains. Several genes potentially related to betalain biosynthesis, such as cytochrome P450-like (), have been identified in pitaya fruit, while their transcriptional regulation remains unclear. In this work, the potential involvement of a WRKY transcription factor, HpWRKY44, in regulating expression in pitaya fruit was examined.

[Determination of trace elements in different parts of grapefruit by ICP-AES].

In the present paper, a method of simultaneous determination of trace elements in grapefruit was developed by using inductively coupled plasma-atomic emission spectrometry together with HNO3-HClO4 digestion. The contents of fifteen elements, including B, Ba, Ca, Cu, Zn, Mg, Sr, Mn, Fe, Na, Be, Pb, Bi, Cd and As, were determined in four parts, namely flesh, scarfskin, endodermis and seed collected from Guangdong, Guangxi and Ganzhou, respectively. The relative standard deviations for all these elements in this method were between 0.