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\hypersetup{pdftitle={Effect of Seed Priming with Salicylic Acid and Jasmonic Acid on Emergence and Early Growth of Pumpkin (Cucurbita Pepo L.) Seedlings under Drought Stress Condition},pdfauthor={Majid Rostami, Ahmad Javadi},pdfsubject={Tropentag 2018: Abstract},pdfkeywords={Antioxidant enzymes, germination rate, plant hormones, seed priming },pdfpagemode=None,colorlinks=true}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 17-19, 2018, Ghent}}\\[1ex] \Large{``Global food security and food safety:\\The role of universities''\\[2ex]}}
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\Large{\textbf{Effect of Seed Priming with Salicylic Acid and Jasmonic Acid on Emergence and Early Growth of Pumpkin (Cucurbita Pepo L.) Seedlings under Drought Stress Condition\footnote{\textbf{Contact Address:} Majid Rostami, Malayer University, Dept. of Agronomy, Postal Code: 65719- 95863, Malayer, Iran, \mbox{e-mail}: \email{majidrostami7@yahoo.com}}\\[0.8ex]}}
\normalsize{\textsc{Majid Rostami$^{1}$, Ahmad Javadi$^{2}$}}
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\begin{itemize*}
\item[]{\small{\textit{$^{1}$Malayer University, Dept. of Agronomy, Iran}}}
\item[]{\small{\textit{$^{2}$, }}}
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\index[author]{Rostami, Majid}
\index[author]{Javadi, Ahmad}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
Undesirable germination is one of the most important problems that increases the cost of production and reduces the agricultural inputs efficiency. Seed priming is a useful process which can improve the rate and final percentage of germination and also cause the establishment of uniform seedlings in the field. There are several methods for seed priming, but depending on the plant species, a suitable method should be selected. In order to study the effect of seed priming with salicylic acid (SA) and jasmonic acid (JA) on emergence and early growth of pumpkin (Cucurbita pepo L.) seedlings  under drought stress condition, a factorial experiment based on randomised complete block design (RCBD) with four replications was conducted at the greenhouse of Malayer University. Experimental treatments were seed priming with salicylic acid (0, 100 and 200 ppm) and jasmonic acid (0, 50 and 100 ppm) and three levels of drought stress (100, 60 and \mbox{30\,\%} of field capacity). Based on results, drought stress significantly (P$\leq$0.05) affected the percentage and rate of seedling emergence. In the severe drought stress (\mbox{30\,\%} of field capacity) percentage and rate of seedling emergence were decreased \mbox{10\,\%} and \mbox{54\,\%}, respectively. Furthermore, seedling length, seedling dry weight and seedling length vigour index were decreased \mbox{11\,\%}, \mbox{9\,\%} and \mbox{25\,\%}, respectively, whereas at the same condition malondialdehyde and proline content increased \mbox{84\,\%} and \mbox{13\,\%}, respectively. Severe drought stress also increased the activity of catalase and proxidase enzymes in pumpkin seedlings up to 39 and 57 percent, respectively. Seed priming with salicylic acid and jasmonic acid significantly (P$\leq$0.05) decreased the negative effect of drought stress on all of the studied traits except seedling emergence percentage. Simultaneous priming with highest level of salicylic acid and jasmonic acid resulted in highest drought tolerance in pumpkin seedlings.}

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\noindent \textbf{Keywords:} Antioxidant enzymes, germination rate, plant hormones, seed priming 
\index[key]{Antioxidant enzymes}
\index[key]{Germination rate}
\index[key]{Plant!hormones}
\index[key]{Seed!priming }
\end{document}
